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The AQA GCSE Biology specification says you should be able to:
"interpret and explain simple diagrams of negative feedback control."
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Resources for Paper 1 & Paper 2:
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All videos for Biology, Chemistry & Physics, Triple or Combined
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Structured learning pathway
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Whole unit videos for Biology & Chemistry, Triple or Combined
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Revision guides to go with the whole topic videos
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Topic tests to go with whole unit videos
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