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OpenStudy (anonymous):
Was there molecular oxygen in the earth primitive atmosphere? How was that molecule become abundant. @jagr2713
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jagr2713 (jagr2713):
The presence of molecular oxygen in the primitive atmosphere was probably at a minimum and extremely rare. Oxygen became abundant with the emergence of photosynthetic beings, approximately, 1.5 billion years after the appearance of life on the planet.
OpenStudy (anonymous):
Thank you for everything :D
jagr2713 (jagr2713):
Anytime
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