.Diagrams and Dissections:
1. What body part does the octopus use to propel itself through the water?
2. How many hearts does the octopus have? Name them, their location and their function.
3. What controls the nerves in an octopus?
4. What do "freckles" do for an octopus?
5. What is a vestigial part of the octopus, showing us that is was once covered by protective layer.
6.What is the name and function of the main part of the octopus?
7. Describe the buccal mass. What animal is it in? what is its function.
8. How many stomachs do starfish have?
9. What is the name of the top of an animal?
10. What is the name of the bottom of an animal?
11. What are five parts of the starfish that each ray has in common?
12. What does a starfish use to detect light and dark?
13. What do starfish eat?
14. What part of the starfish is used to pry clam shells apart?
15. Trace the path of water in a starfish- using the parts involved
16. Why does a starfish need to be in water? What does it use water for?
17. What are four similar body parts in the starfish and sea urchin? Why would these be needed in both?
18. What was your favorite animal to dissect?
19. Which body part-out of all three animals was the most awesome radical cowabunga?
20. What parts do we have in common with the sea urchin?
21. How might they be evolutionarily linked? Think of the purposes of the body parts.
22. Which of the animals would you want to be? why?



1. Siphon
2. 3 total 2 branchial 1 systemic- located at bottom of ctendium- circulating blood to all areas.
3. brain
4. camouflage
5. shell rudiment
6. mantle, where all living systems are.
7.large digestive structure attached to mouth and esophagus.
8.2
9.dorsal/aboral
10.ventral/oral
11. pyloric caeca, ambulacral groove, tube feet, ossicles, pyloric duct, eyespot
12.eyespot
13. clams, scallops, oysters, coral, fish
14. tube feet
15.madreporite, stone canal, ring canal, ambulacral groove, tube feet
16. to be able to move, eat by moving tube feet.
17. Mouth, madreporite, ring canal, anus, gonads, -eating, using water to move, getting rid of digetive waste, reproduction18. All of them19. Aristotles Lantern20. Mouth, esophagus, anus, rectum, pharynx, small intestine, large intestine, teeth, connective tissue, gonads, 21. Evolution has favored these traits- Mouth-eating using a similar structure to most animals, seals body from outside when not in use. esophagus for food transport regardless of gravity direction, anus/rectum- getting rid if waste, sealing from outside. pharynx-taking food from mouth and moving it to esophagus. small intestine-absorbing nutrients. large intestine-absorbs water, stores waste.teeth-chomping food. connective tissue-keeping organs in place. gonads-reproduce.
22. up to you. octopus- fast and attacks quickly, radical beak, and eight arms.