जीवमण्डल में क्रियाशील सभ� – McqOptions

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1.	जीवमण्डल में क्रियाशील सभी चक्रों में सबसे मंदगति से संपादित होता है -
A.	अवसाद -चक्र
B.	जल-चक्र
C.	फास्फोरस -चक्र
D.	कार्बन-चक्र
Answer» B. जल-चक्र

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