17. the Phylum Cnidaria Includes What Organisms?

Name ______

Cnidarians

17. The phylum Cnidaria includes what organisms?

18. All cnidarians are ______organisms except for the

______which is found in freshwater.

19. Cnidarians all have ______symmetry and

______or arms that have stinging cells called

______. These stinging cells shoot out like a

______and contain a ______that can kill or paralyze their prey.

20. Cnidarians have _____ body layers; an inner ______and an outer ______.

21. Cnidarians have ______opening into their hollow bodies called the

______so food enters and wastes leave through this same opening.

This is called a ______digestive system.

22. The hollow cavity the mouth opens into is called the

______cavity. 23. Cnidarians have 2 body forms. ______forms have the mouth & tentacles located at the top like Hydra, corals, and sea anemones.

______forms like the jellyfish have their tentacles and mouth located at the bottom.

24. Some cnidarians like the ______go through both polyp and medusa forms in their life cycle.

25. Cnidarians have a simple nerve ______and can reproduce both

______and ______.

26. Corals build ______cases that make underwater

______.