1. Discuss in your own words what zoologist Libbie Hyman meant with her description of echinoderms as "..a noble group especially designed to puzzle zoologists." What animals did she especially enjoy? What was her area of research? 1 point.

2. Describe how a sea star preys and feeds on a bivalve. What did oyster gatherers have to learn about sea stars to prevent greater infestations of sea stars? 1 point.

3. Trace the water vascular system from madreporite to the tube feet. Describe in your own worlds the shape and function of the ampulla. 1 point.

4. Describe how sand dollars feed. 1 point.

5. How does the madreporite location of a sea cucumber differ from that of other classes of echinoderms? 1 point.

6. Why are botanical terms used to describe some of the crinoid's anatomy? Give an example to illustrate your point. 1 point.

7. In your opinion, why do scientists find so many fossils of crinoids? Furthermore, why do you think crinoids were so common in the past and had such large body sizes, compared with present crinoids? 1 point.

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