OCR Gateway A B2.1.1 Diffusion Summary

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OCR Gateway A Biology and Combined Science revision summary on B2.1.1 - Diffusion for the higher and foundation tier. This is for the OCR Gateway course with first examinations in 2018.
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i just wanted to thank you wright science. i watch your videos as my main revision and i got the highest grade in my class for my b2 mock. thanks!

kalasy.