Biology, 11.03.2021 21:10 stackpoolekrysp71si4
After the Earth developed a magnetic field and before single-celled photosynthetic organisms appeared on Earth, what was the atmosphere like? *
1 point
mostly hydrogen and helium
85% water vapor, 10% carbon dioxide, 5% nitrogen
78% nitrogen, 21% oxygen, 0.9% argon, 0.1% all other gases
there was no atmosphere before single-celled orgamisms
Answers: 3
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After the Earth developed a magnetic field and before single-celled photosynthetic organisms appeare...
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