Which highly reactive gas was probably absent from the earth's primitive atmosphere? o2 (oxygen gas)

2 answers
Question:

Which highly reactive gas was probably absent from the earth's primitive atmosphere? o2 (oxygen gas) water vapor methane carbon dioxide

Answers

Oxygen gas was most likely absent from Earth's primitive atmosphere.  The current theory is that the Earth's early atmosphere was composed of mainly carbon dioxide and methane due to the high volcanic activity.  Cyanobacteria and their use of photosynthesis was what caused earth's atmosphere to become oxygen enriched.
I hope that helps.

The answer is : oxygen gas
In primitive earth's era, (possibly billions years ago), the earth still has't filled with living organism as it is today. Many scientist predicted that it was filled with singular-cells anaerobic organisms , which do not need oxygen to live

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