Question

what are corals? (sub geo)

Answer 1

a hard stony substance secreted by certain marine coelenterates as an external skeleton, typically forming large reefs in warm seas.

Answer 2

Coral polyps are tiny, soft-bodiedorganisms related to sea anemones andjellyfish. At their base is a hard, protective limestone skeleton called a calicle, which forms the structure of coral reefs. Reefs begin when a polypattaches itself to a rock on the sea floor, then divides, or buds, into thousands of clones.

hope it is correct