+A **concentration gradient** is the gradual difference in the concentration of a dissolved substance in a solution over a distance. This difference drives the natural movement of particles from an area of higher concentration to an area of lower concentration, a process known as [Diffusion](/wiki/Diffusion). It is a fundamental principle in [Cell Biology](/wiki/Cell_Biology), vital for transport across membranes.
+## See also
+- [Diffusion](/wiki/Diffusion)
+- [Osmosis](/wiki/Osmosis)
+- [Active Transport](/wiki/Active_Transport)
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