Enter your Name:   Enter your E-mail Address:  Define the following terms: 01a. Amoebocytes 01b. Metamorphosis 01c. Polyp 01d. Medusa 01e. Mesoglea 01f. Mutualism 01g. Commensalism 01h. Parasitism 02. Give one example each of a marine organism that exhibits (1) radial symmetry and (2) bilateral symmetry. 03. What are the two possible forms of support in sponges? 04. Despite the fact that polyps are generally stationary, cnidarians with only a polyp form can spread to populate vast regions of the ocean. How do they accomplish this without moving? 05. Give at least three features common to cnidarians in both the polyp and medusa stages. 06. Which of the three classes of phylum Cnidaria is composed of organisms spending most, if not all, of their life cycle as a large medusa form: the Hydrozoa, theScyphozoa, or the Anthozoa? 07. A coral reef is a colony of anthozoan polyps. What part of it is actually alive? 08. An organism has a brain. Is it most likely bilaterally symmetric or radially symmetric?? 09. A worm has no gut. Of the worms we studied in this module, which kind is it? 10. Give an example of a parasite from this module. 11. An organism is described as having a definite head and rear end; its long, thin body is made up of a series of similar compartments; and it has a definite, fluid-filled coelom. In what phylum would you classify this animal? 12. The lophophorates are grouped together because all the organisms have a lophophore. What is this structure, and what does it do?