Question

Which one of the following is a distinctive character of class Bivalvia of the phylum Mollusca
A) Absence of a head
B) Presence of arms or tentacles around the mouth
C) Absence of gills
D) Presence of a coiled shell

Answer 1

Presence of arms or tentacles around the mouth
➡️ is a distinctive character of class Bivalvia of the phylum Mollusca