The mechanism helping substances to move from lower concentration to higher
concentration.
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Diffusion. Diffusion is a passive process of transport. A single substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across a space.
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Active transport is the mechanism helping substances to move from lower concentration to higher concentration. It can take place irrespective of concentrations also and any substance can move through this process. It requires energy to be spent.
Osmosis also helps substances move from lower to higher concentration, but it takes place through a semi-permeable membrane and only solvent like water can move from lower to higher concentration. It does not require any energy to be spent.
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