The atmosphere is a mixture of gases. it is mostly composed of oxygen and carbon dioxide, nitrogen and oxygen, carbon dioxide and water vapor, nitrogen and carbon dioxide

The correct answer is B. Nitrogen and Oxyen

Explanation

The Earth's atmosphere is a gaseous layer that surrounds the earth, this layer is mostly composed of Oxygen with 21% and Nitrogen close to 78%, in addition to a minimum amount of Argon of about 1%. The Earth's atmosphere is of great importance for life on Earth because it allows the sun's rays to not enter the earth with the same intensity that they are produced, they also make the surface temperature regulated on the earth allowing the lifetime. So, the correct answer is B. Nitrogen and oxygen