Question

During origin of life, which among the following was not found in free form?

• A. Methane
• B. Ammonia
• C. Oxygen
• D. Hydrogen

Answer 1

Answer:

C. Oxygen

• Oxygen was not found in free form.

• It was produced mainly by blue green algae.

• U.V rays broke down water vapor present in molten mass to oxygen and hydrogen.