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During origin of life, which among the following was not found in free form?(a) Methane(b) Ammonia(c) Oxygen(d) HydrogenThis question was addressed to me in exam.I would like to ask this question from Evolution in chapter Evolution of Biology – Class 12

Answer»

The correct OPTION is (C) Oxygen

The BEST I can explain: Oxygen was not found in FREE FORM. It was produced mainly by blue green algae. U.V rays broke down water vapor present in molten mass to oxygen and hydrogen.



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