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Pinworms, hookworms, trichinella
they live in aquatic or moist environments, or in bodies of dead or living organisms
nematodes are found in a wide array of habitats from marine to fresh water and soil
round smooth and tube-like, tapered ends, more complex than flatworms because of two body openings, vermiform
fluid in space allows for movement and pressure from fluid is supportive
living tissues of animals and plants or rotting, but don't necessarily decompose tissues, may be parasitic