lelelele4679 lelelele4679

01-11-2019
Biology

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During an early phase of the planet's existence, Earth's atmosphere was similar in composition to the atmospheres of Mars and Venus. At that time Earth's principal atmospheric gas was:a. nitrogenb. carbon dioxidec. oxygend. water vapore. argon

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Gigi007 Gigi007

02-11-2019

The answer is b. Carbon Dioxide

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