Selection — Easy
Recall and familiar applications. Optional hints help you find a first step.
Includes extension practice
Natural/artificial selection and antibiotic resistance are required. Detailed xerophyte and hydrophyte adaptations in the shared set are extra named-case content.
Easy, Normal and Difficult describe practice demand; they are not the official Core and Extended tiers.
- Cambridge 0973 syllabus2028–2029 · B17.2.1–4
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