IB ESS 2.3.4 Carbon flows
IB ESS 2.3.4 Carbon flows

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise describing carbon stores and flows through photosynthesis, feeding, respiration, death and decomposition in ecosystem cycles.
How this is tested
- describe how a carbon store absorbs carbon from producers and supplies it to consumers
- explain how respiration, decomposition and human combustion add carbon dioxide to air
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