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Nous somme des grosse barbabace. Abonne-toi à mon blog! Notre presentation a nous deux! En fait, on est deux UN .
How do cell membranes help maintain homeostasis? By controlling what substances may enter or leave the cell. What is passive transport? Process where some substances can cross the cell membrane without the input of energy. The movement of molecules from an area of higher concentration to an area of lower concentration. What is a concentration gradient? The difference in the concentration of molecules across a distance. What causes differences to occur? What molecules may.