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What is 1 + 3?
movement of molecules from a high concentration to low concentration with out the use of energy.
movement of molecules from a high concentration to a low concentration though a membrane.
the diffusion of water.
molecules of substances will continue to move from one area to another until a number of molecules is equal in the two areas
movement of molecules from a low to high concentration with the use of energy.
the process of a cell taking in a substance by surrounding it with the cell membrane.
the process of a cell releasing waste.