Diffusion Substances move from a high to a low concentration down a concentration gradient Carbon dioxide, oxygen, water, food substances, wastes, eg urea No Osmosis Water moves from a high to a low ...

Osmosis refers to the movement of water molecules only. The slideshow shows an example of osmosis showing the direction of movement of water between two different concentrations of sugar solutions. In ...

Even though the concept is important to plant and human physiology, osmosis is understood in biology and chemistry in simple -- and often incorrect -- way. Osmosis - the flow of a solvent across a ...