How has free {O₂} been released into earth's atmosphere whereas there was no free {O₂} at ti

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6.Evolution

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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

Solution

It's Obvious

Standard 12

Biology

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