How has the free ${O_2}$ been released into the earth's atmosphere whereas there was no free ${O_2}$ at the time of origin of life
How has the free ${O_2}$ been released into the earth's atmosphere whereas there was no free ${O_2}$ at the time of origin of life
- A
By catabolic activity of animals
- B
By photosynthetic activity
- C
By heating of the earth
- D
None of the above
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