A. oxygen
B. nitrogen
C. hydrogen
D. carbon dioxide
Check Answer
The correct answer is B. nitrogen.
Air contains approximately 78% nitrogen, 21% oxygen, and 1% other gases such as argon, carbon dioxide, neon, helium, and hydrogen.
Air contains approximately 78% nitrogen, 21% oxygen, and 1% other gases such as argon, carbon dioxide, neon, helium, and hydrogen.
