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ACTIVE TRANSPORT:-The movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy.

The movement of a chemical substance across a cell membrane without expenditure of energy by the cell, as in diffusion.
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Active transport is the process when the substances are transported from a region of lower concentration to higher concentration.this requires the use of energy rich molecules like ATP

passive transport happens when the substances are transported from a region of higher concentration to lower concentration.it does not acquire any metabolic energy.
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