Why are Platyhelminthes known as flatworms?

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Solution

Animals in the phylum Platyhelminthes are called flatworms because they are dorsoventrally flattened from head to tail. They are simply bilateral, unsegmented soft-bodied invertebrates. Flatworms are dorso-ventrally flattened. Flatworms have three germ layers exoderm, endoderm, and mesoderm but lack a body cavity or coelom.

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