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Parasitic platyhelminthes are flatworms that live in or on other organisms, called hosts, and derive nutrition at the host's expense. These organisms are dorsoventrally flattened, bilaterally symmetrical, acoelomate, and triploblastic. They include two main groups: trematodes (flukes) and cestodes (tapeworms). Trematodes are usually endoparasites of vertebrates, while cestodes ________ _____ _____ ______ _______ ______ ________ __________ __________ __________.
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