Reef-building corals do not typically reside at depths greater than 20 meters. Why?
a. The oxygen levels are too low to support.
b. There is no available calcium carbonate to build their exoskeletons.
c. There is insufficient light to support their dinoflagellate symbionts.
d. There are no protists at those depths.
c. There is insufficient light to support their dinoflagellate symbionts.
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