How are osmosis and diffusion alike

They both move molecules from high to low concentration, they both usually move things across a membrane, but diffusion is not always across a membrane. It can just be molecules moving.

Osmosis and diffusion are alike in a way that in both motion of molecules/water is in the direction of concentration gradient.Osmosis and diffusion are passive process (energy free).Explanation:Osmosis is the process of movement of water from high concentration of water to low concentration of water across the permeable membrane.Diffusion is the transport of materials from high concentration to low concentration.Concentration gradient means the Movement always from higher to lower concentration of materials.So in the osmosis and diffusion movement is always from high to low concentration.