Parasitic flatworms are majorly the members of phylum Platyhelminthes. Parasitic flatworms are generally triploblastic, symmetrical, and lack anus.
The planarian is a flatworm but is not a parasitic worm.
The parasitic flatworms are:
- Tapeworms are parasitic worms, which belong to the class Cestoda. It exists in symbiotic relationships, in which one organism is harmed and the other is benefitted. The tapeworms are found in human intestines.
- Flukes are the flatworms belonging to the class Trematoda. These are the internal parasite of mollusks and vertebrates. The flukes have a complex life cycle and can reproduce sexually on a vertebrate host.
Thus, the correct answer is Option A.
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https://brainly.com/question/1538101
