True coelom appeared first in the course of e | vedclass

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(B) The true coelom is a body cavity that is lined by mesoderm on all sides. In the course of animal evolution,the phylum $Annelida$ is the first grou

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Annelida

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(B) The true coelom is a body cavity that is lined by mesoderm on all sides. In the course of animal evolution,the phylum $Annelida$ is the first group to exhibit a true coelom (eucoelomate condition). Organisms in $Aschelminthes$ are pseudocoelomates,while $Echinodermata$ and $Chordata$ are also coelomates but appeared later in the evolutionary timeline.

True coelom appeared first in the course of evolution in

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