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Which of the following gases was not present in the atmosphere at the time of origin of life?1. O22. CO3. NH34. CH4

Answer» Correct Answer - Option 1 : O2

The correct answer is O2.

  • O2  was not present in the atmosphere at the time of origin of life.

  • The atmosphere of the earth was not initially favorable for the development of life.
  • Origin of life is a kind of chemical reaction, which first generated complex organic molecules and assembled them.
  • The last phase in the evolution of the earth is associated with the origin and evolution of life.
  • The original atmosphere at the time of origin of life was rich in methane, ammonia, water vapor, and the noble gas neon, but it lacked free oxygen.
  • Thus, there was no free oxygen available in the primitive atmosphere.


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