The calcium hydroxide experiment demonstrates that
A. there is a much higher concentration of CO2 in expired air than in atmospheric air.
B. there is a much higher concentration of O2 in expired air than in atmospheric air.
C. the concentrations of CO2 in expired air and atmospheric air are approximately equal.
D. there is a much lower concentration of O2 in expired air than in atmospheric air.
E. there is a much lower concentration of CO2 in expired air than in atmospheric air.
Answer: A
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