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B3b Diffusion
1. The diffusion is the net movement of particles from an area of higher concentration
to an area of lower concentration. It is a natural process.
2. Enzymes control and catalyse many chemical reactions in living things. Which of
the following process that is not controlled by enzymes.…

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(i) What is the scientific name for the air sacs in lungs?
alveoli
(ii) 1 His alveoli has more surface area than John or Alan
2 His alveoli has more blood capillaries so higher chance of diffusion


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