जीवमंडल में N2 की मात्रा किस – McqOptions

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1.	जीवमंडल में N2 की मात्रा किसके कारण स्थिर रहती है?
A.	N2 fixation
B.	औद्योगिक प्रदूषण
C.	नाइट्रोजन चक्र
D.	absorption of N2
Answer» B. औद्योगिक प्रदूषण

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