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Which of the following gases was the least abundant in the earth's atmosphere 3.5 billion years ago? a) carbon dioxide b) nitrogen c) oxygen d) hydrogen e) water vapor
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Which of the following gases was the least abundant in the earth's atmosphere 3.5 billion years ago? a) carbon dioxide b) nitrogen c) oxygen d) hydrogen e) water vapor

User CoolBots
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5 votes

Answer:

oxygen

Step-by-step explanation:

Oxygen was the least abundant in the earth's atmosphere 3.5 billion years ago

User Dbburgess
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