Diffusion is the movement of molecules from
a. an area of low concentration to an area of high concentration.
b. an area of high concentration to an area of low concentration.
c. an area of equilibrium to an area of high concentration.
d. all of the above

Diffusion is the movement of molecules from higher concentration to low concentration. Diffusion systems vary like evaporation of alcohol in an alcohol-water system, evaporation of moth ball, etc. Diffusion is a natural phenomena that is related to the technology reverse osmosis. Answer is B.

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