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Molecules move randomly because of the
energy they have. Diffusion is the
movement of molecules from an area of
high concentration to an area of low
concentration (net movement). Example:
the diffusion of oxygen into the cells of
the body from the blood stream as the
cells are respiring (and using up oxygen).
This is a special type of diffusion that
only occurs with water. It's molecules also
move randomly requiring no energy form
the cell. Osmosis can only occur across a
partially permeable membrane from a
dilute solution to a more concentrated
solution.…read more


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