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A student placed samples of onion epidermal cells (plant) and human red blood cells into two different solutions: Solution A (distilled water) and Solution B (concentrated sucrose solution, water potential lower than the cells' contents). After 20 minutes, the cells were examined.
Compare the effects of Solution A and Solution B on the appearance and integrity of the onion cells and red blood cells. In your answer, explain the movement of water in terms of water potential and osmosis, and describe the role of the cell wall where relevant.