Question

coal reef is formed by tiny sea creatures called _____​

Answer 1

Answer:

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Explanation:

Most structures that we call "coral" are, in fact, made up of hundreds to thousands of tiny coral creatures called polyps. Each soft-bodied polyp—most no thicker than a nickel—secretes a hard outer skeleton of limestone (calcium carbonate) that attaches either to rock or the dead skeletons of other polyps.

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Answer 2

Explanation:

coal reeefs are made up of hundreds to thousands of tiny coral creatures called polyps.