The correlation between sea surface temperature and water vapor is that both are driven by seasonal changes. They both increase in the hemisphere during summer. Seasonal changes in water vapor are, however, more evident across the land, largely due to changes in land surface temperature.
Not sure if I'm correct but my best guess is the cell membrane seeing as it surrounds the cell itself and is responsible for allowing certain molecules to diffuse in or out of the cell. Good Luck! :)
