EVERYDAY SCIENCE

Detailed explanation-1: -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-2: -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-3: -Animals belonging to the phylum Platyhelminthes are also called flatworms due to dorsoventrally flattened bodies. They are relatively simple, bilateral, unsegmented and soft-bodied invertebrates. Members of this phylum range in size from a single-celled organism to around 2-3 feet long.

Detailed explanation-4: -Liver fluke belongs to phylum Platyhelminthes. Organisms belonging to this phylum are bilaterally symmetrical, triploblastic and are either free-living or parasitic. Jellyfish on the other hand, belongs to the phylum Coelenterata, whereas earthworm and leech belongs to Annelida.