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Coral reefs are underwater organisms in class of Anthozoa that is typically living in compact colonies of the exact same polyps. They secrete calcium carbonate, which is a common compound within rocks, to form a hard skeleton. Propagation is usually a ...

Coral are marine organisms in class of Anthozoa that is often living in compact colonies of identical polyps. They secrete calcium carbonate, which is a common substance within rocks, to create a hard skeleton. Propagation is a form of reproduction ach...