Answer:
I think it's water vapor, but I don't know
Explanation:
water vapor
"an advantage of gas exchange in fresh water, compared with gas exchange in air, is that water loss through evaporation across the respiratory surface can be minimized." The primary function of the lungs involving the transfer of oxygen from inhaled air into the blood and the transfer of carbon dioxide from the blood into the exhaled air.
Second option- because if there is too much of the owls, it will be imbalanced and the mouse population will go down
