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28 September, 04:29

Which of the following statements about Earths atmosphere is true?

Earths atmosphere contains 78 percent water vapor which is essential to life.

Earths atmosphere contains 21 percent oxygen.

Earths atmosphere contains carbon dioxide which all life forms require.

Earths atmosphere allows radiation from the sun to pass through it and warm Earths surface.

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  1. 28 September, 06:23
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    I think the correct answer from the choices listed above is the second option. Earths atmosphere contains 21 percent oxygen. The atmosphere is a thin layer of a mixture of gases which consists of about 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and trace amounts of other gases.
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