In an isotonic solution, the concentration of solutes inside the cell is equal to the concentration of solutes outside the cell. This means that there is no net movement of water into or out of the cell, as water will move in and out equally to maintain equilibrium.
Given this information, let's evaluate the options:
a. Some CO2 will leave the cell. - CO2 can diffuse out of the cell since it is a small, nonpolar molecule. This option is likely correct.
b. Some H2O will leave the cell. - In an isotonic solution, there is no net movement of water, so this is not correct.
c. Some O2 will enter the cell. - While O2 can diffuse into the cell, the scenario describes isotonic conditions where the focus seems to be more on the balance rather than the specific direction of movement. However, O2 can still enter if there is a gradient.
d. Some H2O will enter the cell. - Again, in an isotonic solution, there is no net movement of water, so this is not correct.
Based on the explanations, option a (Some CO2 will leave the cell) is the best choice, as CO2 can diffuse out of the cell without the use of energy.
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