Chapter 21, Problem 21.41QP

Interpretation Introduction

Interpretation: The reason for calcium carbonate to be a major exoskeleton material in shells is to be stated.

Concept introduction: The outer shells of marine organisms are made up of mostly calcium carbonate ( ${\text{CaCO}}_{\text{3}}$) in a matrix of proteins and polysaccharides.

To determine: An explanation for calcium carbonate to be a major exoskeleton material in shells.