Edexcel OLevel Biology revision notes

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Lesson

Lesson-4.2.2- understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer.

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Lesson-4.2.1- understand the names given to different trophic levels, including producers, primary, secondary and tertiary consumers and decomposers.Previous Lesson-4.2.3- understand the transfer of substances and energy along a food chain.Next