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Diffusion describes dispersion of a contaminant through a bulk fluid. Osmosis describes dispersion of a contaminant through a membrane or divider of some sort.
An apple is red, and it has a slight resemblance of a sphere, except that at the bottom and at the top it sort of caves in. At the top of an apple it has a small twig. This is the stem, and it goes through the apple and the seeds are almost always close the stem. Apples can be many colors, such as green, yellow, and red but they always blend in together.