A way for substance A to move from outside of the cell to inside is osmosis (a kind of passive transport) with no such requirement of energy.
Osmosis is the passage of water molecules from a region of higher concentration to a region of lower concentration through a selectively permeable membrane. Water enters and exits cells via osmosis. Until the exterior solution and the cytosol are isotonic, cells placed in a hypotonic solution will take in water across their membrane.
In reality, osmosis is a form of passive transport. Cells shrink when placed in hypotonic solution. Energy is not needed. Particles travel from areas of high concentration to areas of low concentration in this process. A semi-permeable membrane allows only the solvent to pass through it (solute does not move).
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