The two main biological activities in the Ca and Si cycles are the biosynthesis of shells and exoskeletal material as well as the mineralization of these materials in sediments.

Question

Quizplus · Accepted Answer

The biosynthesis of shells and exoskeletal material involves the incorporation of calcium and silica, respectively, into the biological structures. After the organism dies, these materials can mineralize in sedimentary environments, contributing to the Ca and Si cycles.

The Two Main Biological Activities in the Ca and Si