Question

_______What are corals ?_______​

Answer 1

Answer:

A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups.

Explanation:

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Answer 2

Answer:

a coral reef in am underwater ecosystem charaterized by reef building corals.