Which gas found in today's atmosphere was absent in the Hadean's and Archean's?
A)nitrogen
B)water vapor
C)oxygen
D)carbon dioxide

Name: Which gas found in today's atmosphere was absent in the Hadean's and Archean's? A)nitrogen B)water vapor C)oxygen D)carbon dioxide
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Oxygen was absent in the Hadean and Archean atmospheres as it was only introduced through photosynthesis by cyanobacteria around 2.5 billion years ago. Nitrogen, water vapor, and carbon dioxide were present in these early atmospheres.

Which Gas Found in Today's Atmosphere Was Absent in the Hadean's