Coral bleaching occurs when corals expel their symbiotic food-producing algae due to stress. What is the primary trigger?

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A Low ocean tides
B Rising sea surface temperatures
C Heavy rainfall
D Deep-sea mining

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Answer: B. Rising sea surface temperatures

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• Explanation: B) Rising sea surface temperatures is correct because global warming stresses coral polyps, forcing them to reject the algae that give them life and color.

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Coral bleaching occurs when corals expel their symbiotic food-producing algae due to stress. What is the primary trigger?

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