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Reefs: Rainforests of the Ocean

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Corals are simple, bottom-dwelling animals whose fundamental unit is the polyp, which has a common opening to take up food and excrete wastes, surrounding a ring of tentacles. Each polyp sits in its own cup in a limestone skeleton, which the coral constantly builds as it grows upwards. Polyps use weak stinging cells in their tentacles to capture small animal plankton from the water. Reef-building corals live in large colonies made by repeated divisions of genetically identical polyps. These colonies come in an astonishing variety of branching, leafy, or massive forms, which may grow continuously for thousands of years. They are related to jellyfish, sea anemones, and a variety of soft corals that lack massive limestone skeletons.

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