What is a croal reef?
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A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups.
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A coral reef is an underwater habitat that is characterised by corals that construct reefs. Coral polyp colonies are bound together by calcium carbonate to build reefs. Coral reefs are most typically seen at shallow depths in tropical oceans, but they can also be found on a smaller scale in deep water and cold water.
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