IB Biology SL B4.1.5 Coral reef formation conditions
IB Biology SL B4.1.5 Coral reef formation conditions

IB Biology syllabusFirst assessment 2025
Practise linking coral reef formation to limiting factors affecting zooxanthellae and coral cover, including light, temperature, salinity, pH, and CO2.
How this is tested
- state a limiting factor for zooxanthellae that can affect reef formation
- explain how increased CO2 can reduce calcium carbonate formation in corals
- interpret evidence showing how ocean temperature changes relate to coral cover
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