Which two gases make up 99% of the atmosphere? – McqOptions

MCQOPTIONS

1.	Which two gases make up 99% of the atmosphere? (UPTET Feb 2014)
A.	Ozone and oxygen
B.	Oxygen and nitrogen
C.	Carbondioxide and ozone
D.	Argon and ozone
Answer» C. Carbondioxide and ozone

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