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most cells and tissues contain large amounts of water- up to 95% in some, with an average of 70-80% water throughout all organisms. molecules must dissolve in water in order to move easily in and between living cells. polar molecules, such as sugar, and ions such as Na+, dissolve in water because of an electric attraction between them and the water molecules. non-polar molecules, such as fats and oils, do not dissolve in water.

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15y ago

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