Biology
Grade-8
Easy
Question
Which of the following elements were not found in free form during the origin of life?
- Methane
- Ammonia
- Hydrogen
- Oxygen
Hint:
The oxygen was not present in free form during formation of earth
The correct answer is: Oxygen
- Atmospheric of the primitive earth was reducing because the hydrogen atoms was most numerous and most reactive
- Large quantity of water ammonia, nitrogen, methane were present
- Free oxygen was not present. Hence oxygen was absent during the formation of earth
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