NEET BIOLOGY

Detailed explanation-1: -Flatworms (phylum Platyhelminthes) are simple animals that are slightly more complex than a cnidarian. Roundworms (phylum Nematoda) have a slightly more complex body plan. Segmented worms (phylum Annelida) are the most complex animals with worm-like body plans.

Detailed explanation-2: -flatworm, also called platyhelminth, any of the phylum Platyhelminthes, a group of soft-bodied, usually much flattened invertebrates. A number of flatworm species are free-living, but about 80 percent of all flatworms are parasitic-i.e., living on or in another organism and securing nourishment from it.

Detailed explanation-3: -The flatworms come under Phylum Platyhelminthes and comprise a very diverse group of worms, with 12, 821 species described (WoRMS, 2016). The parasitic flatworms, such as tapeworms and liver flukes, are included within this large phylum.

Detailed explanation-4: -Three classes of the Platyhelminthes phylum include the Cestoda, Trematoda, and Turbellaria classes. The Cestoda class is made up of tapeworms.