Natural Science CLEP Prep Practice Exam

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The atmosphere is composed of

  1. Nitrogen and carbon dioxide

  2. Oxygen and carbon dioxide

  3. Nitrogen and oxygen

  4. Carbon dioxide and water vapor

The correct answer is: Nitrogen and oxygen

The atmosphere is composed of primarily two gases, nitrogen and oxygen. While both carbon dioxide and water vapor are present in the atmosphere, they are relatively small amounts compared to nitrogen and oxygen. Therefore, options A, B, and D are incorrect as they do not comprise the majority of the atmosphere.

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