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the spontaneous, passive movement of water molecules from an area of higher water concentration (higher water potential) to an area of lower water concentration (lower water potential) across a differentially permeable membrane, until the concentration is the same in both regions.
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus...
a chemical substance found in food that is essential for maintaining life.