Which part in a mollusk produces a shell?

their mantle

Explanation:

The external shell is formed in the part of a mollusk known as the mantle, which is a muscular fold of skin that helps it move along. Calcium Carbonate is an element which is naturally produced inside of the mantle. Calcium Carbonate is what makes the shell hard. An example of a mollusk would be a clam, although mollusks can also live on land, such as common snails.

the atmospheric gas that forms a mild acid when dissolved in water is called carbon dioxide. the correct answer is a. 2.) chemical weathering would cause an inscription on a marble headstone to become harder and harder to read over time.