Aphrodite, known as the "Sea Mouse", is a/an .........

Metamerism or metameric segmentation is a characteristic feature of

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

What type of muscles are present in the body wall of animals belonging to the phylum $Annelida$?

Which of the following is an invertebrate,triploblastic,and coelomate organism?

Which one of the following is not a hermaphrodite animal?