Distribution and main characteristics of coral reef ecosystems; environmental conditions associated with reef development
Coral reefs are highly biodiverse underwater ecosystems built by tiny animals called coral polyps. They grow only in warm, shallow, clear tropical seas.
Real World
The Great Barrier Reef off Queensland, Australia, stretches 2,300 km and hosts over 1,500 fish species, illustrating the exceptional biodiversity possible only where water temperature stays between 23°C and 29°C year-round.
Exam Focus
Quote specific environmental thresholds (temperature range, depth, salinity) rather than vague terms like 'warm, shallow water' to target Level 3 marks.
Essay Framework
Use PEEL to structure every paragraph. Tap each step for guidance and an example.
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