Read the passage: A coral reef is a large underwater structure made of living and dead corals. These reefs form in tropical seas between 30° north and south of the equator, where they shelter many fish and other animals. Most present-day reefs grew after the last ice age, when rising seas flooded the continental shelves and coral communities built reefs upward as the water rose. Because corals need warm, sunlit water, they grow near the surface, which makes them vulnerable to human activity. Pollution from boats and coastal building clouds the water and cuts sunlight; toxic substances can bleach and kill corals. Many countries now restrict construction near reefs and regulate shipping to protect them. According to the passage, why do corals grow near the water's surface?
ATo escape pollution
BTo avoid ships
CBecause of the last ice age
DThey need warm, sunlit water
Answer & Solution
Correct answer: D. They need warm, sunlit water
The passage states corals 'need warm, sunlit water', so they grow near the surface.
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