Ecosystems, sampling and material cycles

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Describe levels of organisation in an ecosystem and explain interdependence, competition and how abiotic and biotic factors affect communities
Explain structural, behavioural and functional adaptations, including those of extremophiles
Interpret food chains and predator–prey cycles, and (Edexcel, OCR, Cambridge) construct pyramids of biomass and calculate the efficiency of biomass transfer

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Describe the carbon and water cycles and the role of microorganisms in decomposition; (Edexcel, OCR, Cambridge) the nitrogen cycle

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