Passage: 'Coral reefs cover less than one percent of the ocean floor, yet they support about a quarter of all marine species. Reef-building corals live in partnership with tiny algae inside their tissues. The algae use sunlight to make food, part of which they share with the coral, while the coral gives the algae shelter. When seawater becomes too warm, corals expel the algae and turn white, a process called bleaching, which can leave them weak and likely to die.' What is the passage mainly about?
Answer and explanation
Correct answer: A. The importance of coral reefs and the partnership that sustains them
The passage describes the value of reefs and the coral-algae relationship.
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