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nikklg [1K]
3 years ago
10

Can someone really help me ASAP!!!

Biology
1 answer:
4vir4ik [10]3 years ago
5 0

Answer:

when a concentration gradient exists and more of the substance is on the inside of the cell

Explanation:

Active transport moves substances against the concentration gradient, from an area of low concentration to an area of high concentration. It requires the use of energy, usually in the form of ATP.

Hope that helps.

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