APP+SCI+MARINE+BIO+Invertebrates+Review+Quiz

 MARINE BIO INVERTEBRATES Review QUIZ (HUBER ch7) At least 97% of all species of animals are invertebrates. || Sponges do not have which feature? || Feeding currents in sponges are produced by flagellated cells called //choanocytes//. || Water enters a sponge through which part? || Radial symmetry, such as seen in Cnidaria, occurs when similar parts of a body are arranged and repeated around a central axis. || In all animals with radial symmetry, || Mature marine //hydrozoan// Cnidaria are mainly colonies of polyps that produce medusae. || The gelatinous bell of a medusa is composed of which of these? || //Scyphozoan// cnidarians may be found in a polyp form, but the medusa stage generally dominates. || In //bilaterally// symmetric animals, the term "bilateral" indicates that there are two ways of cutting the body to get two identical halves. || Marine worms may gain support for the body from which of these means? || Unlike other flatworms, tapeworms have which feature? || Most molluscs have a //radula//, a ribbon-like structure that carries rows of small teeth. || Among mollusks, there is no radula among the || All molluscs have an external shell made of calcium carbonate. || Some gastropods use their radulas to scrape algae from rocks, and some are carnivores that may use the radula to rasp a hole in a prey's shell. || In a bivalve, the gills serve in || Cephalopods use a structure called a funnel to squirt out water from their mantle cavities in order to create a kind of jet propulsion. || Cephalopods are considered to have the most complex brain outside of the vertebrates, capable of advanced learning. || A closed circulatory system always has which of these features? || Arthropods must discard (molt) their chitinous exoskeletons in order to grow. || Echinoderms are characterized by || In a starfish, an external part of the water-vascular system is || Echinoderms, hemichordates and chordates (which include humans) are all thought to be closely related because of common features in early embryonic development. || Sea urchins are carnivores, using modified tentacular tube feet to grasp animal prey. || The mouth is directed downward in the ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 1 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 2 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 2 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Specialized cells ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Gametes ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Supporting structures ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Organs ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 3 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 3 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 4 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 4 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Osculum ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Ostium ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Coelom ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Pinacocytes ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 5 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 5 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 6 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 6 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || There is no head. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || The body plan is in five parts. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || There is no oral surface. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || There is an anterior end. ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 7 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 7 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 8 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 8 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Cnidocytes ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Mesoglea ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Spicules ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Gastrodermis ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 9 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 9 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 10 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 11 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 12 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 11 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 12 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 12 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 13 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 13 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || An exoskeleton ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || A protein skeleton ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || A hydrostatic skeleton ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || An endoskeleton ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 14 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 15 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 15 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 15 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || A long proboscis ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || No digestive tract ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Bright colors ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || A gut with septa ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 16 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 17 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]] ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 18 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 19 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 20 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 21 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 22 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 23 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 20 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 21 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 22 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 23 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 22 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 23 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 23 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 23 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 24 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 24 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Gastropods. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Bivalves. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Cephalopods. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Chitons. ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 25 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 25 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 26 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 26 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 27 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 27 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Gas exchange only. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Gas exchange and feeding. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Gas exchange and shell production. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Gas exchange and production of noxious chemicals. ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 28 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 29 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 29 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 29 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 30 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 30 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 31 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 31 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Blood within distinct vessels ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || A heart with chambers ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Open blood spaces ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || The ability to take up nutrients from seawater ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 32 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 33 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 33 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 33 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 34 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 35 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]] ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 36 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 37 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 38 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 39 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 40 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 41 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 42 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 38 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 39 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 40 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 41 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 42 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 41 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 42 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 42 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 42 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Usually having a heptaradial symmetry. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Having an exoskeleton similar to that of the Arthropoda. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Often moving by use of hundreds of fluid-powered tube feet. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || All of the above. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **E)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Both //b// and //c//. ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 43 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 43 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || The ring canal. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Aristotle's lantern. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || An ampulla. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || A tube foot. ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 44 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 44 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 45 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 46 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 46 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 46 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || True ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || False ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 47 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 47 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] |||| [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="5"]]
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **A)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Asteroidea. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **B)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Crinoidea. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **C)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || Holothuroidea. ||
 * || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="40" height="1"]] || **D)**[[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="10" height="1"]] || star fish. ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 48 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 49 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 50 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 49 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 50 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||
 * [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="1" height="1"]] ||
 * 50 || [[image:http://glencoe.mcgraw-hill.com/olcweb/styles/shared/spacer.gif width="5" height="1"]] ||||  ||

ANSWERS: 1. A 2. D 3. a 4.b 5.a 6.a 7.a 8.b 9.a 10.a 11.a 12.b 13.c 14.a 15.b 16.a 17.b 18.a 19.d 20.a 21.b 22.a 23.a 24.b 25.b 26.a 27.b 28.d 29.a 30.a 31.a 32.a 33.a 34.c 35.a 36.b 37.a 38.c 39.d 40.a 41.c 42.c 43.d 44.a 45.c 46.b 47. b 48.a 49.d 50.b

Dissections: 1. Siphon 2.3 3.