cells are living things, they constantly have to replace substances which are used up (e.g. food and oxygen) and remove other substances which would accumulate (e.g. carbon dioxide, waste products)
Diffusion takes place automatically without the need for energy.
Diffusion is the spreading of the particles of gas which results in a net movement from ahigher concentrated area to a lower concentrated area.
The greater the difference in concentration, the faster the rate of diffusion.
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