Air quality and climate — Difficult
Transfer your understanding to a changed context, justify decisions and check your reasoning. No hints during the test.
Includes extension practice
Air/climate outcomes are official C10.2; catalytic-converter chemistry and some quantitative/cross-topic material extend this section.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- igcse-cambridge-cie-0653 2028–2029 · C10.2; biology photosynthesis outcomes
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