How has the free \[{{O}_{2}}\] been released into the earth's atmosphe – McqOptions

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1.	How has the free \[{{O}_{2}}\] been released into the earth's atmosphere as 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
Answer» C. By heating of the earth

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