The gas X is only about 20 parts out of 10 parts of air in the atmosph – McqOptions

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1.	The gas X is only about 20 parts out of 10 parts of air in the atmosphere. It is needed for decomposition of organic matter. The gas X is
A.	Carbon dioxide
B.	Water vapor
C.	Oxygen
D.	Nitrogen.
Answer» D. Nitrogen.

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