A Radula is Present in Members of Which Clade(s)

Question

A radula is present in members of which clade(s)?
A) chitons
B) bivalves
C) gastropods
D) cephalopods
E) both chitons and gastropods

Accepted Answer

Radula, a tongue-like organ with rows of teeth, is present in both chitons and gastropods. Bivalves lack a radula, and cephalopods have a modified radula known as a beak.