engineering recuitment NMDC Maintenance Assistant Fitter 2021 Mock Test General Knowledge Ecology and Environment

जीवनाच्या उत्पत्तीच्या वेळी वातावरणामध्ये खालीलपैकी कोणता वायू अस्तित्वात नव्हता?

1
O2
2
CO
3
NH3
4
CH4
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