Substances may move into and out of cells across the cell ____ by diffusion.____ is the net movement of particles from an area of high ____ to an area of ____ concentration. Diffusion is a ____ process - the particles have their own ____ which makes them move randomly. ____ diffuses into cells by diffusion and carbon dioxide diffuses out in gas ____. Amino ____, glucose and fatty acids are products of chemical digestion. They diffuse through the wall of the small ____, where the concentration of these substances is high, and move into the ____, where they are at a lower concentration.

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