What is the difference between osmosis and diffusion? A Osomsis is the movement of molecules from an area of low concentration to an area of high concentration; diffusion is the opposite.

B Osmosis is the movement of water across a membrane; diffusion is the movement of molecules from a higher to a lower concentration, with or without the presence of a membrane.

C Diffusion is the movement of water across a membrane; Osmosis is the movement of molecules from a higher to a lower concentration, with or without the presence of a membrane.

D Diffusion is the movement of molecules from an area of low concentration to an area of high concentration; osmosis is the opposite.