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Earth's first atmosphere was composed of mainly which of the following gases? O hydrogen and helium O carbon dioxide and oxygen O nitrogen and oxygen O carbon monoxide and ozone
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Earth's first atmosphere was composed of mainly which of the following gases?

O hydrogen and helium
O carbon dioxide and oxygen
O nitrogen and oxygen
O carbon monoxide and ozone

User Syphirint
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5 votes

Answer:

A

Step-by-step explanation:

Hopefully this helps

User SparkOn
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