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Title: OCR Biology A, A-level: 3.1.1 Exchange surfaces - specialised exchange surfaces
Description: detailed notes on specialised exchange surfaces, including notes on how to calculate SA:Vol Ratios.

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Title: OCR Biology A, A-level: 3.1.1 Exchange surfaces - specialised exchange surfaces
Description: detailed notes on specialised exchange surfaces, including notes on how to calculate SA:Vol Ratios.