The common characteristic between flatworms and roundworms is:

Triploblastic body organization

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Coelom absent

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Presence of pseudocoelom

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Both A and B

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Solution

The correct option is A Triploblastic body organization
Flatworms belong to the phylum Platyhelminthes and roundworms belong to the phylum Nematoda/Aschelminthes. Both flatworms and roundworms are triploblastic i.e. made of three germ layers: ectoderm, mesoderm, and endoderm.
Flatworms do not have a coelom whereas, roundworms possess a pseudocoelom.
So, the correct answer is option A.

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In which triploblastic animal, coelom is absent?

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