ACET

Practice session

Read the passage, then answer the question. "Coral reefs occupy less than one percent of the ocean floor, yet they support roughly a quarter of all marine species. This astonishing biodiversity arises because reefs provide food, shelter, and breeding grounds for countless organisms. When ocean temperatures rise, however, corals expel the algae living in their tissues, losing their color and their main energy source in a process called bleaching." According to the passage, why do coral reefs support such high biodiversity?

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