Master Topic B4 of OCR Gateway Science A GCSE Biology (J247): ecosystems and interdependence, food chains and food webs, competition and adaptation, sampling with quadrats and transects, biodiversity and human impact, and the recycling of materials through the carbon, water and nitrogen cycles, including decomposition and the rate of decay. Worked calculations, required-practical method steps, exam tips and graded model answers for Foundation and Higher tiers.
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