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what symmetry do animals have if they can be divided in half along a single line? radial
which of the following do not belong to the same group? snails
marine worms can live in all but which of the following? soil
the body plans of cnidarians are polyp and which of the following? larva
which of the following is a parasite? tapeworm
which of the following groups of animals molt? earthworms
which of these organisms has a closed circulatory system? oyster
what structures help protect sponges from predators? spicules
which of the following organisms has two body regions? mollusk