concentration gradient

concentration gradient - concentration. A drop of dye...

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Diffusion is a random movement of molecules down the pathway  called the  concentration gradient.   Molecules are said to move down the concentration gradient because  they move from a region of higher concentration to a region of lower 
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Unformatted text preview: concentration. A drop of dye placed in a beaker of water illustrates diffusion as the dye molecules spread out and color the water....
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