Segmentation in the body is first observed in which of the following:

Which of the following characteristics is $NOT$ found in the phylum $Annelida$?

Closed blood vascular system,presence of hemoglobin in the blood,and chitinous setae or parapodia are the characteristics of which phylum?

In which of the following is the clitellum absent?

$A$: Annelids exhibit extracellular digestion.
$R$: The digestive tract in annelids is complete.

$A$: 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.