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Which was absent in the atmosphere at the time of origin of life?

 
Biology
Last Post by Mayank1444 4 years ago
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22/10/2021 10:57 am
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BidishaKashayap1333 
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Which was absent in the atmosphere at the time of origin of life?

(1) O2

(2) NH3

(3) CH4

(4) H2

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22/10/2021 10:58 am
Mayank1444 
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Correct answer: (1) O2

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