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What exactly is coral?

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ATOB2 | 18:48 Fri 01st Dec 2000 | Animals & Nature
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What is coral made of?
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Avatar Image Isaacr
The living coral polyp is as small as a baby's fingernail and has a mouth and tentacles to suck up plankton. It secretes calcium carbonate to form a skeletal shell as hard as concrete. After it dies, the next generation simply grows on top of it and so, eventually the coral reefs build up.
16:15 Fri 05th Jan 2001

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