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Which of the following gases was most likely present in earths earliest atmosphere

Which of the following gases was most likely present in earths earliest atmosphere
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1 vote
Which of the following gases was most likely present in earths earliest atmosphere

User Nybon
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2 Answers

7 votes

Oxygen, because water must have been present when Earth first formed.

User AmdY
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7.7k points
5 votes

the correct answer is hydrogen

User Owen Cao
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