Question

Nitrogen constitutes nearly __ % of the atmosphere.

• A. 45
• B. 78
• C. 21
• D. 0.03

Answer 1

Answer: (B)

78

The air in Earth's atmosphere is made up of approximately $78$ percent nitrogen and $21$ percent oxygen. Air also has small amounts of lots of other gases, too, such as carbon dioxide, neon, and hydrogen.
Hence answer is $78$%