Question

what are corals and coral reefs​

Answer 1

Answer:

Corals are invertebrate animals belonging to a large group of colourful and fascinating animals called Cnidaria. Other animals in this group that you may have seen in rock pools or on the beach include jelly fish and sea anemones.

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.

Answer 2

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 story corals , whose polyps cluster in groups.

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