O-LevelBiologyRespiration5090/12 · May/June 2019 · Q171 Mark
The table shows the percentages of four gases in inspired and expired air. inspired air expired air 0.04 4.14 0.50 2.00 20.80 12.20 78.50 78.50 Which gas is carbon dioxide?
A0.04, 4.14
B0.50, 2.00
C20.80, 12.20
D78.50, 78.50
✓ Correct answer
A: 0.04, 4.14
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