Long TextExercise 67 of 83

Coral reefs occupy less than one percent of the ocean floor, yet they support approximately twenty-five percent of all known marine species. Often referred to as the 'rainforests of the sea,' these complex ecosystems provide food, income, and coastal protection for hundreds of millions of people worldwide. They are…

• Why does the writer compare coral reefs to rainforests?
• What happens to coral during the bleaching process?