In the animal kingdom,the first time appearan | vedclass

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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:

Similar Questions

$A$: True coelom originated for the first time in phylum $Annelida$.
$R$: It allowed the animal to have an alimentary canal longer than the body and space for storing gametes.

Which of the following options correctly represents the characteristic features of phylum $Annelida$?

Which structure serves as an organ for excretion and osmoregulation in the phylum $Annelida$?

Movement of coelomic fluid helps in locomotion of

$A$: The first circulatory system is observed in the phylum Annelida.
$R$: The first true coelom is observed in the phylum Annelida.

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