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 low 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 exchange. Urea is a waste product that diffuses out of ____ cells where it is made into the blood plasma. The urea is then transported to the ____ to be excreted.

Diffusion

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