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jolli1 [7]
3 years ago
8

The controls the materials that enter and leave the cell.

Biology
1 answer:
zysi [14]3 years ago
5 0
Cell membrane is the answe
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: Notice the rate of diffusion increases as the concentration gradient increases. If the concentration of molecules outside the cell is very high relative to the internal cell concentration, the rate of diffusion will also be high.

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