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प्रश्न
During the origin of life, which among the following was not found in free form?
विकल्प
Methane
Ammonia
Oxygen
Hydrogen
MCQ
उत्तर
Oxygen
Explanation:
Oxygen was not present in its free form at the time life first evolved. Blue-green algae were the main source of its production. UV rays converted the molten mass water vapour to oxygen and hydrogen.
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Geological Time Scale
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