Discussion
The temperature that provides favourable ecological conditions for living coral reefs is
Answer: D
Reef-building corals need warm water, and they thrive where the mean annual temperature is above about 20 degrees C (best at 23 to 25 degrees). This is why coral reefs are limited to the tropical seas between about 30 degrees north and south, mainly on the west side of oceans. Water cooler than 20 degrees C, as in the options below 10, 10 to 15 and 15 to 20 degrees C, does not allow the living reef to develop. So more than 20 degrees C is the answer.
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