How are coral reefs formed?

Coral reefs are formed through the accumulation and growth of coral polyps over long periods of time. These intricate ecosystems primarily develop in warm, shallow waters, typically between 23 and 29 degrees Celsius (73 to 84 degrees Fahrenheit). The reef-building process involves a symbiotic relationship between corals and tiny algae _______ __________ _________ _________ ___ ______ ____ ___ ____.
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