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Cellophane is a good analogy. It is a semi-permeable membrane which is permeable to water and small molecules, but not to large molecules, and can be used to demonstrate the principal of osmosis. Cellophane is made out of plant fibers called cellulose but living membranes are made out of layers of fat cells.
-DJ Craig
First answer by DJ Craig. Last edit by DJ Craig. Contributor trust: 914 [recommend contributor]. Question popularity: 30 [recommend question]





