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This fully-editable PowerPoint covers: Organisation in an ecosystem, using quadrats to sample an ecosystem, biodiversity, the effect of changing abiotic and biotic factors, food chains and food webs, how a changing population affects a food chain or web, trophic levels, definitions of terms such as top carnivore, pyramids of number, pyramids of biomass, energy transfer in a food chain, the carbon cycle, the nitrogen cycle, deforestation, pollution, the greenhouse effect, global warming, how humans are affecting global warming, polluting water, eutrophication.

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