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Amazing Coral Reef: Coral Reef Structure and Variety
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A coral reef is a collection of tiny animals called coral polyps that build the reef structure out of calcium carbonate (limestone), over thousands of years. Coral polyps eat plankton and live in... (more info)

A coral reef is a collection of tiny animals called coral polyps that build the reef structure out of calcium carbonate (limestone), over thousands of years. Coral polyps eat plankton and live in colonies within a reef that may be hundreds of miles long.

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