A Land Snail, a Clam, and an Octopus All Share

Question

A land snail, a clam, and an octopus all share
A) a mantle.
B) a radula.
C) gills.
D) embryonic torsion.
E) distinct cephalization.

Accepted Answer

A mantle is a thin tissue layer that covers the body of these three organisms. In land snails, the mantle secretes a calcium carbonate shell, in clams, it secretes the shell, and in octopuses, it aids in movement and acts as a protective layer.