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The contractile vacuole allows free-living protists to expel extra water. <b>The contractile vacuole allows free-living protists to expel extra water <br /></b>.
Water Vapor, CO2 and O2 pass through stomata. The Stomata are located on the underside of the leaf (lower epidermus) in order to prevent water loss from direct sunlight via evâ¦aporation. The upperside (spper epidermus) of the leaf prevents water loss by evaporation.