A passage states: 'Coral reefs support thousands of marine species, protect coastlines from erosion, and provide food for millions of people worldwide. Yet rising ocean temperatures continue to bleach and kill these ecosystems at an alarming rate.' What is the main idea?
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A
Ocean temperatures are rising due to climate change.
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B
Coral reefs are vital ecosystems that are threatened by warming oceans.
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C
Millions of people rely on fish from coral reef areas.
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D
Bleaching is the primary cause of coral reef destruction.