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When a cell allows molecules to go in and out of the cell membrane, this is an

example of what? *

User Annick
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Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.
User Joshuaegclark
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