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ElenaW [278]
3 years ago
15

A/An _______ exists when different concentrations of a substance exist on either side of a membrane.

Biology
1 answer:
Alecsey [184]3 years ago
4 0

Answer:It is known as a concentration gradient which in diffusion will always flow from ares of high concentration to areas of low concentrations  

So i believe the answer to this is A.

Explanation:

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