Which of the following is considered the appropriate concentration of – McqOptions

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1.	Which of the following is considered the appropriate concentration of carbon dioxide for the natural balance of the atmosphere?
A.	0.02 प्रतिशत
B.	0.03 प्रतिशत
C.	0.04 प्रतिशत
D.	0.05 प्रतिशत
Answer» C. 0.04 प्रतिशत

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