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C. Student # 2 predicts that the vacuole will appear smaller and the chloroplasts and nucleus will have moved due to the cell membrane shrinking as water exits through osmosis.

Explanation:

Adding the drop of water to the slide puts the cell in a hypertonic solution and the water inside the cell will rush out of the cell to where there is less water, causing the cell to shrivel.

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

not sure but try c two haploid cells

explanation: