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Coral reefs are often called the "rainforests of the sea" due to their incredible biodiversity. underwater structures built colonies of animals coral polyps. are found in warm, , clear ocean and support 25% of all species. Reefs protect coastlines from storms and erosion, and they are a source of food and income for millions of people. The vibrant colors of coral reefs come from microscopic algae that live in a symbiotic relationship with the corals.