2. A sponge’s skeleton is made of ________________.

3. Most ____________________________ are internal parasites.

4. There are _____________ classes of mollusks.

5. Sponges can reproduce ________________________________________________.

6. Flukes and tapeworms are types of ______________________________.

7. Jellyfish and coral are types of ________________________.

8. ___________________ have tentacles with nematocysts (stinging cells).

9. ____________________ are hermaphroditic (have male & female reproductive systems).

10. Clams, mussels, and oysters are types of ______________________.

11. Mollusks have 3 basic body parts: head, foot, and _____________________________.

12. Another name for roundworms is _____________________________________.

13. Some ___________________________, like Ascaris, can cause diseases in animals and humans.

14. Snails and slugs are types of __________________________.

15. Squids, octopuses, and nautiluses are types of ________________________.

16. Snails feed with a rough tongue called a ____________________.

17. _____________________ were the 1st animal to evolve nephridia to collect and discharge waste.

18. __________________ lose their chordate characteristics as adults.

19. Earthworms, leeches, and marine worms are examples of ____________________________.

20. _______________________ are segmented worms.

21. There are 3 main groups of chordates: tunicates, ________________________, & vertebrates.

22. A starfish is an example of a/an _____________________________.

23. __________________ have jointed appendages, a segmented body, and a chitin exoskeleton.

24. Insects, crustaceans, and arachnids are types of ___________________________.

25. ________________________have a water vascular system to move their tube feet.