Answer:
The correct answer is a mantle.
Explanation:
A mantle refers to an essential component of the body of molluscs. It refers to a delicate covering produced from the body wall that at certain occasions get strengthened by calcium carbonate.
In various species of molluscs, the epidermis of the mantle discharges calcium carbonate and produces a shell over the entire body. The mantle encloses the stomach, heart, gonads, and intestines of the molluscs.
Answer:
Sunlight does not reach the bottom.
Explanation:
It honestly depends on how deep, Coral is more suited for shallow waters, where sunlight reaches.
The answer is A. the presence or absence of an envelope
A fertilization and reproduction