Diffusion - The net movement of particles from an area of high concentration to an area of low concentration, Concentration - The number of particles of a substance in a given volume, Concentrated - A solution that contains a high number of dissolved particles and a low number of water particles, Concentration gradient - The movement of particles from an area of high concentration to an area of low concentration, Solution - A mixture that contains two or more substances, usually a solute dissolved in a solvent, Surface area - The total area of the outermost surface of an object, Surface area to volume ratio - The ratio between the surface area of an object and the volume of the object, Unicellular organisms - Organisms which are made up of one cell only, Osmosis - The net movement of water particles from an area of high water concentration to an area of low water concentration across a membrane, Multicellular organisms - Organisms that are made up of more than one cell,

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