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inysia [295]
2 years ago
10

During an early phase of the planet's existence, Earth's atmosphere was similar in composition to the atmospheres of Mars and Ve

nus. At that time Earth's principal atmospheric gas was:a. nitrogenb. carbon dioxidec. oxygend. water vapore. argon
Biology
1 answer:
Charra [1.4K]2 years ago
5 0
The answer is b. Carbon Dioxide
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