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2 April, 23:01

Which of the following gases was most likely present in Earth's earliest atmosphere? A) nitrogen B) hydrogen C) argon D) oxygen

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  1. 3 April, 02:41
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    Hydrogen was one of the gases that were most likely present in the Earth's earliest atmosphere. With the hydrogen, there was also methane, water vapor, and ammonia. Carbon Dioxide was also present and there was hardly any oxygen, if at all, present in the early atmosphere.
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