Found mostly in marine environments, members of the ____ flatworm lineage are free-living, and acquire food with a muscular pharynx; most are hermaphroditic.

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Turbellaria is the class of flatworms that are mostly free-living and found in marine environments. They use a muscular pharynx to ingest food and are typically hermaphroditic, unlike the other options which include parasitic classes (Trematoda and Cestoda) or belong to different phyla entirely (Polychaeta - annelids, Hirudinea - leeches).

Found Mostly in Marine Environments, Members of the ____ Flatworm