cell membrane allows sine things to enter and leave the cell
movement of substances without the use of energy
movement of molecules from many to fewer
molecules are evenly spread out
diffusion of water through a cell membrane from high to low
large molecules can diffuse through the membrane with the help of transport proteins
when energy is needed to move materials though the cell membrane
large molecules are taken in to the cell by a pinching in of the cell membrane
large molecules are released from the cell and placed in a vacuole, releases its contents
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