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Roundworms are a member of the nemathelminths phylum or group of animals. The hookworm, pinworm and trichinella are part of this group. They are more advanced than flatworms but less advanced than earthworms. They have thin round bodies, with none of the pieces or segments that earthworms have in their bodies.

Roundworms live in salt water, fresh water and the soil. Many of them are harmful to man as they are parasites.

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14y ago

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