Here is a short summary of "What is it?":
Coral reefs are structures formed by living organisms, found in oceans with little or no nutrients in the water. They cannot live in water with high nutrients as algae will form, harming the reefs.
The organisms which form the reefs give out calcium carbonate. After a while, they will accumulate and form coral reefs, to support a lot of other animals and plants. Reefs are also home to a large variety of other organisms, including sponges, Cnidarians (which includes some types of corals and jellyfish), worms, crustaceans (including shrimp, spiny lobsters and crabs), molluscs (including cephalopods), echinoderms (including starfish, sea urchins and sea cucumbers), sea squirts, sea turtles and sea snakes.
Thursday, August 28
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