Question

multiple choice question
what body region secretes a calcium carbonate shell in many mollusk species?
o mantle
o radula
o visceral mass
o foot

Explanation:

The mantle is a key body part in mollusks. It has the function of secreting materials. In many mollusk species, it specifically secretes calcium carbonate to form the shell. The radula is a feeding structure (like a tongue - like organ with teeth in some mollusks). The visceral mass contains internal organs (such as the digestive, circulatory, etc. systems). The foot is mainly for locomotion (for example, in snails, it is used for crawling).

Answer:

mantle