D4.2.1—Stability of natural ecosystems Topic Practice
D4.2.1—Stability of natural ecosystems Topic Practice

IB Biology syllabusBiology SL/HLFirst assessment 2025
Students practise evaluating long-term ecological data to distinguish ecosystem stability from transient fluctuations in natural communities.
How this is tested
- interpret time-series data from ancient forests or deserts to assess stability over decades or centuries
- link abiotic buffering capacity to observed stability in undisturbed ecosystems
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