To determine which cells will likely grow larger over time, we need to consider the concentration of magnesium in each liquid relative to the concentration inside the cells.
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Cell W is in a liquid with slightly more magnesium than the cell itself. This could lead to a situation of equilibrium or some uptake of magnesium, positively affecting growth.
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Cell X is in the liquid with the least amount of magnesium. This is likely to lead to a negative impact on growth, as the low concentration may not support the cell’s needs.
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Cell Y is in a liquid with slightly less magnesium than the cell. This could potentially lead to a loss of magnesium from the cell, which is not conducive to growth.
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Cell Z is in the liquid with the most amount of magnesium. High external magnesium concentration can promote osmotic balance and is likely to support cell growth.
Based on this analysis, cells W and Z are likely to grow larger over time due to the favorable conditions for them (W with slightly more magnesium and Z with the most magnesium).
So, the answer is cells W and Z.