Question

what do you understand by Coral​

Answer 1

Explanation:

a hard stony substance secreted by certain marine coelenterates as an external skeleton, typically forming large reefs in warm seas.

"a coral reef"

Answer 2

Answer:

Corals are short-lived microscopic organisms which live in colonies. They flourish in shallow mud-free and warm waters. They secrete calcium carbonate. The coral secretion and their skeletons form coral deposits.