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निम्नलिखित में से कौन-सा/से पृथ्वी पर कार्बन चक्र में कार्बन डाइ-ऑक्साइड का योगदान करता है/करते हैं?
1. ज्वालामुखी क्रिया 2. श्वसन
3. जैव पदार्थ का क्षय 4. प्रकाश संश्लेषण
कूट
(a) 1 और 3
(b) केवल 2
(c) 1, 2 और 4
(d) ये सभी
Civil Services Entrance Exams-Medium-Hindi
Oneday Exams-Medium-Hindi
UPSC
General Study (GS)
UPPSC
HPPSC
MPPSC
BPSC
RPSC
NET/JRF
SSC(CHSL)
SSC(CGL)
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