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Why does diffusion occur in a cell?

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Diffusion is when a molecule moves down its concentration gradient — from an area of high concentration to an area of lower concentration. The ultimate goal is to reach equilibrium, where both sides have an equal concentration of the molecule. read more

Diffusion is a process that occurs when a substance such as water, molecules, and ions, which are usually needed for various cellular processes, enter and leave cells. The way that cell diffusion happens is by molecules moving from an area of high concentration to an area of low concentration. read more

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10. Transport System in Organisms E-learning - Diffusion ...
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