Why do coral reefs die?

Despite their importance, warming waters, pollution, ocean acidification, overfishing, and physical destruction are killing coral reefs around the world. ... Genetics is also becoming a larger area of coral research, giving scientists hope they might one day restore reefs with more heat tolerant coral.

warming waters, pollution, ocean acidification, overfishing, and physical destruction are killing coral reefs around the world.

Explanation:

"a.) well–developed vascular system."

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