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An increase or decrease in the density of a chemical substance in an area. Cells often maintain concentration gradients of ions across their membranes. When a gradient exists - the ions or other chemical substances involved tend to move from where th

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1. An increase or decrease in the density of a chemical substance in an area. Cells often maintain concentration gradients of ions across their membranes. When a gradient exists - the ions or other chemical substances involved tend to move from where th





 
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