1. What happens to an arthropod during molting?

2. An endoskeleton is

3. Which of the following happens at a joint?

4. What is cartilage?

5. What is the role of muscles?

6. A signal that causes an animal to react in some way is called a

7. The most complex nervous systems have a nerve cord and

8. Sensory neurons are nerve cells that

9. An animal that moves using a water vascular system is a

10. Webbed feet are most useful for an animal to move