Question

oxygen
9. The atmosphere of the Earth is composed of nitrogen and
and other gases.
A. 0% and 100%
C. 78% and 21%
B. 21% and 78%
D. 505 and 505​

Answer 1

Answer:

C. 78% and 21%

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Answer 2

oxygen

9. The atmosphere of the Earth is composed of nitrogen and

and other gases.

A. 0% and 100%

C. 78% and 21%

B. 21% and 78%

D. 505 and 505

answer....

78% and 21%