A certain gas is used by living organisms for respiration, and this is – McqOptions

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1.	A certain gas is used by living organisms for respiration, and this is used in the process of combustion. In the process of combustion, the gas reacts with combustible substances to produce heat. The mentioned gas is
A.	Oxygen
B.	Nitrogen
C.	Carbon dioxide
D.	Carbon monoxide
Answer» B. Nitrogen

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