Q: What makes up 99 percent of air?


Read this paragraph and choose the correct option from the provided answers:

Figure below shows the main gases in air. Nitrogen and oxygen make up 99 percent of air. Argon and carbon dioxide make up much of the rest. These percentages are the same just about everywhere in the atmosphere.

 Choices:

- oxygen and dioxide

- phosphorus and oxygen

- dioxide and nitrogen

- nitrogen and oxygen


A:
nitrogen and oxygen