The outer layer of the molluscan shell is called the ____ layer.
A) foot
B) collagen
C) nacreous
D) prismatic
E) periostracum

Question

Quizplus · Accepted Answer

The periostracum is the outermost layer of the molluscan shell, consisting of a thin organic layer that protects the underlying shell and helps prevent dissolution by acidic water. The foot is a muscular structure used for movement; collagen is a protein found in connective tissues but not specifically in the shell; the nacreous layer is the innermost layer of the shell and is composed of calcium carbonate crystals; the prismatic layer is the middle layer of the shell and also consists of calcium carbonate crystals.

The Outer Layer of the Molluscan Shell Is Called the ____