Answer:_____________
Explanation:_____________
Go somewhere where there aren't any windows
Answer:
Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls - allow gases to pass through. Extensive blood supply - ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.
Preventing ph changes caused by the rising and falling pco2 of the plasma
