Answer:
Diffusion is defined as the motion of a particle (substance) from a region of higher concentration to a region of lower concentration. It takes place in the case of both liquids as well as gases. It is because the particles present in the liquid and gas move randomly from one place to another. It plays a significant role in the body of living organisms because, with the help of this process, the substances are allowed to enter and eliminate out of the cells.
Osmosis is defined as the movement of water (fluid), through a membrane that is semi-permeable in nature (as in the case of a living cell) into a solution that is comprised of a comparatively higher concentration of solute, thereby balancing the solute concentrations on both sides of the membrane.
