In which of the following phyla did a true co | vedclass

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(C) true coelom is a body cavity that is completely lined by mesoderm. In the evolutionary history of animals,the phylum $Annelida$ is the first group

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Annelida

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(C) true coelom is a body cavity that is completely lined by mesoderm. In the evolutionary history of animals,the phylum $Annelida$ is the first group to exhibit a true coelom (eucoelom). $Platyhelminthes$ are acoelomate,$Aschelminthes$ (Nematoda) are pseudocoelomate,and $Annelida$ marks the beginning of the coelomate condition.

In which of the following phyla did a true coelom first evolve?

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