Aquatically free-living flatworms live in streams, lakes, and oceans. External parasitic flatworms live on the host's skin, mouth, or gills; internally parasitic flatworms live in the organs of the host such as the intestine and liver.
Most roundworms are free-living, and are found in virtually all parts of the Earth - in soil, salt flats, aquatic sediments, polar or tropical regions, and even hot springs. However, some species are parasitic roundworms that live within a particular host.
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