Q. Which was absent in the atmosphere at the time of origin of life?
A) $NH_{3}$
B) $H_{2}$
C) $O_{2}$
D) $CH_{2}$
Explanation
Primitive atmosphere of earth was reducing containing methane, ammonia, hydrogen and water vapour. There was no free oxygen.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.