Question

Which gas was absent in the atmosphere at the time of origin of life?
a. ammonia
b. hydrogen
c. oxygen
d. methane

Answer 1

from the origin of the earth oxygen is absent on earth

Answer 2

Dear student,

● Answer - (c)

Oxygen gas was absent in the atmosphere at the time of origin of life.

◆ Explanation -

• The primitive atmosphere of the earth was devoid of oxygen.
• Components of prebiotic atmosphere were water vapour, methane, CO, hydrogen, nitrogen, ammonia, etc.
• As the earth cooled down, water wapor condensed to form oceans.

Thanks dear. Hope this helps you...