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Around four hundred million years after the formation of Earth, the planet's atmosphere would have been almost entirely _____. A. argon B. oxygen C. nitrogen D. carbon dioxide
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Around four hundred million years after the formation of Earth, the planet's atmosphere would have been almost entirely _____.

A. argon
B. oxygen
C. nitrogen
D. carbon dioxide

User Nickang
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Answer:

D.) Carbon Dioxide

Step-by-step explanation:

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User Torlack
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