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Corals are colonial animals that build a calcareous framework in which to live. They feed by filtering plankton from the water flowing past them but also contain in their bodies a symbiotic algae which also provides them with food. Indeed it is this algae which gives corals their vibrant colors and without these algae the corals will eventually die. As the algae are plants they need sunlight to photosynthesize and grow and this means that coral reefs need to be at depths where sunlight can penetrate.

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16y ago

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