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Answer -
CO2 movesby diffusion – These cellular waste accumulates in high concentrations in thecell, whereas the concentration of CO2 in the external surroundings is comparatively lower. Thisdifference in the concentration level inside and out of the cell causes the CO2 todiffuse from a region of higher(within the cell) to a lower concentration.
H2Odiffuses by osmosis through the cell membrane. It moves from a region of higherconcentration to a lower concentrated region through a selectively permeablemembrane until equilibrium is reached.