IB ESS 3.1.5 Natural selection process
IB ESS 3.1.5 Natural selection process

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise outlining natural selection as variation, competition and heritable advantages changing populations through differential survival.
How this is tested
- outline how variation and competition for limited resources drive differential survival
- describe how isolation can change selection pressures and favour adapted populations
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