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(B) true coelom is a body cavity that is lined by mesoderm on all sides.In the animal kingdom,the phylum $Annelida$ is the first group to exhibit a tr

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Annelida

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(B) true coelom is a body cavity that is lined by mesoderm on all sides.In the animal kingdom,the phylum $Annelida$ is the first group to exhibit a true coelom (eucoelom).$Platyhelminthes$ are acoelomate (lack a body cavity).$Coelenterata$ (Cnidaria) are also acoelomate.$Protozoa$ are unicellular organisms and do not possess a body cavity or tissue-level organization.Therefore,the correct answer is $Annelida$.

In the animal kingdom,the first time appearance of a true coelom is present in:

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