The molluscs look so different,and yet we can tell they are related because they all
A)are segmented.
B)are predators.
C)have an external skeleton.
D)have a mantle,visceral mass,and a foot.
E)have shells.

Question

Quizplus · Accepted Answer

The presence of a mantle, visceral mass, and a foot is a defining characteristic of the phylum Mollusca. This is what makes them all related, despite their diverse appearances and lifestyles. While not all molluscs have shells (such as squids and octopuses), they all have the three major anatomical features listed in choice D.

The Molluscs Look So Different,and Yet We Can Tell They