In evolution,which of the following evolved f | vedclass

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(B) The phylum $Annelida$ is characterized by the presence of a true coelom (eucoelom),which is a body cavity lined by mesoderm on both sides. While b

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True coelom

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(B) The phylum $Annelida$ is characterized by the presence of a true coelom (eucoelom),which is a body cavity lined by mesoderm on both sides. While bilateral symmetry and triploblastic nature appeared earlier in the evolutionary timeline (in phylum $Platyhelminthes$),the true coelom made its first appearance in $Annelida$.

In evolution,which of the following evolved for the $1^{st}$ time in $Annelida$?

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