Diffusion is the ____ of substances from where there is a higher concentration (____) to where there is a lower concentration (very ____). Until eventually all the molecules are ____ distributed. This happens with small molecules like ____ Substances move ____ and out of cells through the cell ____ by the process of ____. For example, ____ diffuses into our red ____ cells to be carried around the body. It then diffuses ____ of the red blood cells when it reaches cells that need it.

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