A manometer has a sample of gas in one end and is open to the atmosphere on the other
end. The atmospheric pressure is 760 mm Hg. The difference in mercury levels is 60 mm (the
mercury is higher on the side open to the atmosphere). What is the pressure of the gas?
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Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

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