Question

D. Increased body surface area QUESTION 47 Ambient air gas concentrations approximate: A. 21% O2, 3% CO2, 76% N2 B. 18% O2, 3% CO2, 79% N2 C. 16% 02,5% CO2, 79% N2 D.21% 02, .03% CO2,79% N2 QUESTION 48 All of the following are ways that the body maintains hea A. vasoconstriction of nerinheral blood veceele Click Save and Submit to save and submit. Click Save All Answers

Answer 1

Ans) 21) D. 21% O2, .03% CO2, 79% N2

Explaination:

- By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.