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When does the cell have to use active transport?A.when the cell is low on energyB.when the cell is in a highly concentrated solutionC.to move molecules across the membrane quicklyD.to move molecules across
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When does the cell have to use active transport?A.when the cell is low on energyB.when the cell is in a highly concentrated solutionC.to move molecules across the membrane quicklyD.to move molecules across the membrane against a gradient

User Anders Zommarin
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D. To move molecules across the membrane against a gradient.
User Gmajivu
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