To determine which cells would take in water and swell, we need to consider the principles of osmosis. Osmosis requires understanding the solute concentration in the cell compared to the surrounding liquid.
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Cell W: Saltier than the cell -> This means the surrounding liquid has a higher solute concentration than the cell, so water would move out of the cell, causing it to shrink.
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Cell X: Less salty than the cell -> This indicates that the surrounding liquid has a lower solute concentration than the cell, so water would move into the cell, causing it to swell.
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Cell Y: Higher concentration of water than the cell -> This suggests that the liquid has a lower solute concentration, and water would move into the cell, causing it to swell.
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Cell Z: Lower concentration of water than the cell -> This means the surrounding liquid has a higher solute concentration, so water would move out of the cell, causing it to shrink.
Based on this analysis, the cells that would take in water and swell are Cells X and Y.
Therefore, the answer is: cells X and Y.