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Choral Reefs are very impotant to fishes not only fishes or other sea creatures but also to us. Think, what would happen without coral reefs? Coral Reefs are where the fishes live or their habitat. It is like a rock but underwater and colorful. It is also a diverse underwater ecosystem which is held together by a calcium carbonate. And it is also built from the colonies of the tiny animals found in the marine waters, that who contains a little or few nutrients. 
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Protects us to a big wave in ocean