1.

The Earth's atmosphere is made up of various gases. Which of the following best describes this composition of gases?

A.  Oxygen - 78%, Nitrogen - 21%, Others - 1%
B.  Oxygen - 60%, Nitrogen - 30%, Others - 10%
C.  Nitrogen - 78%, Oxygen - 21%, Others - 1%
D.  Nitrogen - 78%, Oxygen - 21%, Carbon dioxide - 1%
Answer» D.  Nitrogen - 78%, Oxygen - 21%, Carbon dioxide - 1%


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