| GAS | CO2 | N2 | O2 |
| % BY VOLUME | 4 | 72 | 24 |
A. CO2 and O2
B. N2 and CO2
C. CO2, O2 and N2
D. O2 and N2
Correct Answer:
Option A = CO2 and O2
Explanation
The air in Earth’s atmosphere is made up of approximately 78 percent nitrogen and 21 percent oxygen. Air also has small amounts of other gases, too, such as carbon dioxide, neon, and hydrogen.
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