A student places four identical cells into four different liquids. Cell WSaltier than the cellXLess salty than the cellYHigher concentration of water than the cellZLower concentration of water than the cell Which cells would take in water and swell?

Water moves into a cell when the surrounding liquid is less salty, or has a higher water concentration, than the cell. Liquid X is less salty than the cell, and liquid Y has a higher water concentration than the cell, so cells in X and Y take in water and swell. Liquids W and Z have the opposite conditions, so water moves out of those cells.

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