IB ESS 3.1.15 (HL) Earth history & evolution
IB ESS 3.1.15 (HL) Earth history & evolution

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise using fossils and geological timescales to explain how life has evolved across Earth’s 4.5-billion-year history.
How this is tested
- interpret fossil evidence to outline evolutionary change over geological time
- link long-term Earth processes to changes in life forms across the timescale
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