Question

what percentage of the atmosphere is typically made up of oxygen gas? 0.03% 21% 99% 1%

Explanation:

The Earth's atmosphere is composed of various gases. The typical percentage of oxygen gas in the atmosphere is a well - known scientific fact. Among the given options, 0.03% is the percentage of carbon dioxide (a trace gas), 99% is incorrect as the main components are nitrogen and oxygen, 1% is the percentage of argon and other trace gases, and 21% is the correct percentage of oxygen in the atmosphere.

Answer:

B. 21%