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Corals are: A. Poriferans attached to some solid support B. Cnidarians, that are solitary living C. Poriferans present at the seabed D. Cnidarians that live in colonies |
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Answer» Reefs are formed of colonies of coral polyps (a sessile form of members of phylum Cnidaria) held together by calcium carbonate. They are as hard as a rock. The Great Barrier Reef is the world's largest coral reef system. The reef is located in the Coral Sea, off the coast of Queensland, Australia. |
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