When ocean temperatures rise, corals expel the colorful algae living in their tissues, turning them completely white. This process is known as "Coral Bleaching." Why is this a major concern for the environment?

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• A It makes the ocean look more beautiful to divers.
• B Bleached corals provide more food for small fish.
• C Corals are "nurseries" for 25% of all marine life; without them, the food chain collapses.
• D White corals reflect sunlight and keep the water cool.

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