According to Oparin, which one of the following was not present in the primitive atmospehre of the earth?

Options

A. Methane
B. Oxygen
C. Hydrogen
D. Water vapour

Answer

B

Explanation

According to Oparin, the primitive atmosphere of the earth consisted of numerous hydrogen atoms that combined with all oxygen atoms to form water and leaving no free oxygen. Thus, primitive atmosphere was reducing one, without any free oxygen available.