Question

Coral reefs form when the calcite skeletons of coral build upon each other.

Answer 1

The answer is true, I hope this helps

Answer 2

this is true.To form their skeletons, coral animals absorb the element calcium from the ocean water. The calcium is then combined with carbon and oxygen to form calcite.when the animals die, there skeletons stay behind, and eventually, a coral reef starts to biuld up onto them.
hope this helps.