What is the name of the process in which molecules move from an area of high concentration to an area of low concentration across a selectively permeable membrane?

Diffusion.

Explanation:

when molecules move from an area of high concentration (large amount) to an area of low concentration (low amount). ... In simple diffusion, molecules that are small and uncharged can freely diffuse across a cell membrane.

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organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.