The aquatic animals of this phylum possess parapodia for locomotion.

In which of the following is the segmentation best represented?

What is the phenomenon called where the body of some animals is externally and internally divided into segments with a serial repetition of at least some organs?

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

Animals having multiple or numerous setae are included under

$A$: 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.