8: Define the following terms as they relate to cnidarians: radial symmetry: diploblastic: epidermis: gastrodermis: mesoglea: gastrovascular cavity: nerve net: hydrostatic skeleton: polyp: medusa: cnidocytes: nematocysts:

For Phylum Mollusca, Class Cephalopod 1. Organ/system characteristics. Answer the following for each organism:a. How is their circulatory system? b. Excretory/osmoregulation: How does the organism eliminate waste? What organs do they use?c. Skeleton/support: List the structures or ways this organism supports itself.   2. Ecology. Describe/answer the following for each organism:a. Does it have a complete or incomplete digestive system? How does this animal feed?b. Identify any unique feeding structure• Be sure to use the correct terms to identify any unique feeding structure(s) used by theanimal.

Phylum Arthropoda: 1. Comment on the size (number of species) within this phylum. 2. General Body Plan: (circle the appropriate answer) a) Simple or complex, b) Do they have true tissues? Yes or No c) asymmetry, radial symmetry, bilateral symmetry d) Do they have organs? Yes or No e) What type of appendages? f) What type of skeleton? 3. Describe molting.

The gastrovascular cavity of cnidarians has two openings, one serves as mouth and the other serves as anus.   True   False   The body wall of cnidarians has epidermis, gastrodermis and mesoglea.   True   False   Some cnidarians only have a polyp stage.   True   False