The branch of science dealing with the study of birds is

$A$: Annelids,arthropods,and molluscs are protostomial coelomates.
$R$: All three phyla include members with bilateral symmetry and a true coelom.

Which one of the following groups of animals is bilaterally symmetrical and triploblastic?

Select the correct pair.

Phylum $Annelida$ resembles $Mollusca$ in embryonic features because both have

The capacity for regeneration is observed in . . . . . . .