A coral reef is a sea structure, made out of many living organisms which together forms a wall. They are called coral polyps. They spawn eggs to make more polyps. As these organisms move about, they actually help the coral reef settle and gain a more stable structure.
Coral organisms, called polyps can live on their own, but mostly live in big communities. The coral`s exo –skeleton is made out of limestone. Coral polyps are tiny, soft- bodied animals related to sea anemones and jellyfish.
The crown of thorns starfish eats the coral and the coral is part of the reef so it is destroying the reef as well. Also you can stop overfishing too much so the natural life cycle can continue the right way, and keep the number under control.