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arpitpatel86

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On that same question of Destroyer #38 of BIO it says that early earth had a reducing atmosphere ofNH3, H2S, and CH4

i understand that the reduced atmosphere included carbon dioxide (CO2), methane (CH4), carbon monoxide (CO), ammonia (NH3), free hydrogen and water vapor but where does it also include H2S in my reading from shaums nad kaplan and internet research nowhere do i see H2S?
 
The point is that it did not contain O2.

I think that they would put a question about the original atmosphere lacking O2 before any question about H2S on the exam.
 
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