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Which of the following BEST describes the composition of the Earth's atmosphere?

A

The atmosphere is a thin layer of gases that surround the Earth which absorbs radiation and moderates climate.

B

The atmosphere is made up of mostly Oxygen and Hydrogen.

C

The concentration of atmospheric gases is not affected by human activity.

D

The atmosphere is composed of three layers which are known as the stratosphere, troposphere and mesosphere.

E

The pressure and temperature stay constant throughout the atmosphere.

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