वायुमंडलीय ऑक्सीजन का स्र� – McqOptions

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1.	वायुमंडलीय ऑक्सीजन का स्रोत है
A.	नाइट्रोजन चक्र
B.	हरे पौधे
C.	पानी
D.	कार्बन चक्र
Answer» B. हरे पौधे

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