Which Class Am I? Worksheet

I include sea anemones and corals. The polyp stage is dominant, and there is no medusa stage.
I include fire corals, Portugese man-of-war, and hydras. I alternate between polyp and medusa stage.
I include jellyfish. The medusa form is dominant.
I include the tropical box jellyfish and sea wasps. I have a dominant medusa form.
I include snails, nudi branchs, abalones, and limpets. I live in both land and aqautic environments.
I include clams, oysters, mussels, and scallops. I have a soft body that is protected by two hard shells that are hinged together.
I include squid, octopuses, nautiluses, and cuttlefish. I am a carnivore that eats animals such as crustaceans, fish, and other mollusks.
I include the tusk shells. The shells resemble those of an elephant's tusks.
I include the chitons. That means that I have a shell with overlapping plates.
I include small wormlike animals that do not have shells.
I was once believed to be extinct, but I was rediscovered in 1952.
I can be found within the digestive tract of my host. I infect humans when a person walks barefoot over contaminated soil.
I can be found in the gut of my host. I can infect humans when the host accidently swallows eggs picked up from contaminated surfaces.
I can be found in the guts and connective tissues of my host. I infect humans when a person drinks contaminated water.