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

All three organisms share a mantle, which is a layer of tissue that covers and protects the soft body. In land snails and clams, the mantle is involved in the formation of the shell, while in octopuses it is involved in jet propulsion and camouflage. The other options are not shared by all three organisms - a radula is only found in snails, gills are not present in land snails, and embryonic torsion is unique to gastropods (which includes land snails). Cephalization (the development of a distinct head region) is present in all three organisms but not shared exclusively by them, as many other animals also exhibit cephalization.