Substance Exchange: Surface Area to Volume Ratio 🎈 - A Level Biology Learning & Revision

Emma's back with everything you need to know about substance exchange in organisms for your A Level Biology exam. She goes through the important concept of surface area to volume ratio, as well as gas exchange in single-celled organisms. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

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