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You may benefit from taking notes on the water vascular system in MBCB page 39. 1. Give the common names of the four major kinds of echinoderms. 2. How do sea stars walk and grab? 3. What term describes how an animal grows new replacements for lost body parts? 4. What is similar about echinoderms and cnidarians? 5. In what way does echinoderm symmetry differ from that of cnidarians? 6. Describe how some sea stars feed on mussels. 7. What two kinds of structures are scattered between the spines of sea stars? 8. How could you investigate the activities of an animal that does not appear to move? 9. How does a water vascular system work? note sieve plate = madreporite 10. How can a sea star be so flexible and then suddenly become as rigid as a rock? 11. What are the advantages and disadvantages to eating with an extrusible stomach? 12. What are some benefits to being headless, brainless, and not bilaterally symetrical? 13. How do some sea stars sense their world? 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