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AQA A-Level Biology - Topic 3 Questions and Answers 100% Solved

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AQA A-Level Biology - Topic 3 Questions and Answers 100% Solved Smaller organisms have a ........... surface area to volume ratio Higher How do single called organisms exchange substances? Diffuse directly into or out of the cell across the cell surface membrane Give 2 reasons why in multicellular organisms, diffusion across outer membrane would be too slow? 1. Some cells deep within body- big distance between them and outside 2. Larger animals have low surface area to volume ratio- difficult to exchange enough substances to supply large volume What 2 things do most gas exchange surfaces have in common that increases the rate of diffusion? 1. They have large surface area 2. They're thin- short diffusion pathway

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  • aqa a level biology topic 3
  • questions and answers 100 solved
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