Question

What is osmosis and diffusion in biology?

Answer 1

Osmosis is the process of moving a subtance from area of higher concentration to area of lower concentration through a semi permeable membrane.
Diffusion is the process of moving of a substance from the area of higher concentration to lower concentration with out a semi permeable membrane.

Answer 2

osmosis; it is the movement of water molecules across membrane.
diffusion; the process of spreading something more widely....
hope it helps...