Carbon cycle — Easy
Recall and familiar applications. Optional hints help you find a first step.
Includes extension practice
The carbon cycle is required. Nitrogen fixation, ammonium, nitrification, nitrate uptake and denitrification in this shared set are nitrogen-cycle extensions.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- Cambridge 0653 syllabus2028–2029 · B15.3.1
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