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प्रश्न
An abundance of ______ was conspicuously absent from the Earth’s atmosphere 4 billion years ago.
पर्याय
hydrogen
carbon monoxide
nitrogen
free oxygen
MCQ
रिकाम्या जागा भरा
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उत्तर
An abundance of free oxygen was conspicuously absent from the Earth’s atmosphere 4 billion years ago.
Explanation:
The early Earth’s atmosphere was reducing, containing gases like hydrogen, nitrogen, carbon dioxide, methane, and ammonia, but it lacked free oxygen. Free oxygen started accumulating only later, after the evolution of photosynthetic aerobic organisms.
shaalaa.com
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