Reefs grow best in
a.
deep water
b.
low salinity
c.
temperatures below 25°c
d.
shallow water

a. d. shallow water

A coral reef is a part of the aquatic ecosystem that is formed by the colonies of animals called as polyps. These animals secrete hard carbonate exoskeletons that supports and protects the coral polyps. Most corals grow in the water bodies which have shallow, and clear water that receives maximum sunlight.

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