IB ESS 2.5.1 Zonation definition
IB ESS 2.5.1 Zonation definition

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise recognising zonation patterns in figures and explaining how environmental gradients affect species or vegetation distribution.
How this is tested
- identify a vegetation or land-use distribution pattern from a figure
- distinguish zonation over space from succession over time using an ecological example
- suggest an abiotic gradient such as tidal level, soil moisture or elevation
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