Respiration is measured in a human. How do the concentrations of O2 and CO2 in inhaled air compare with exhaled air?
A. Inhaled air has less O2 and CO2 than exhaled air.
B. Inhaled air has more O2 and less CO2 than exhaled air.
C. Inhaled air has more O2 and CO2 than exhaled air.
D. Inhaled air has less O2 and more CO2 than exhaled air.
Answer: B
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