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Biology · GCSE
Materials Cycle. Energy Does Not.
Why carbon goes round for ever while energy passes through once, and what that forces every food chain to look like. Organism to ecosystem, abiotic and biotic factors; the carbon and water cycles and what stops decay; biomass falling at every trophic level, with a worked efficiency calculation; coral reefs, permafrost and irrigated farmland under pressure. Twelve terms to define, a model answer on why food chains are short, and the misconceptions that cost marks.
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