RoundwormRoundworms (Caenorhabditis elegans) live mainly in soil habitats and feed on bacteria that are on dead vegetables. Round worms can grow up to 1 mm in length. These roundworms are commonly used in scientific experiments as their skin becomes transparent when frozen.
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The Muscular SystemRoundworm have longitudinal muscles going along their body under the skin. The roundworms lack the circular muscles that are present in the Annelida phylum. The longitudinal muscles contract and flex in order to allow the worms to wriggle through dirt and move.
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