Question

explain the relation between osmosis and diffusion

Answer 1

Hey.....
Diffusion is the net movement of molecules or atoms from a region of high concentration to a region of low concentration as a result of random motion of the molecules or atoms. 

Osmosis is the process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

Relation is that in both movement takes place from high concentration to low concentration but osmosis is a special case of diffusion as it occurs only in solvent

Hope helps ☺☺

Answer 2

Both diffusion and osmosis processes are consequences of the second law of thermodynamics, which states that the entropy (or amount of disorder) of an isolated system never decreases.