Which of the following was responsible for the initial accumulation of molecular oxygen in the Earths atmosphere about 2 billion years ago?

0 votes
    The production of O2 from the oxidation of iron in the Earths crust..
    The production of O2 by photosynthetic protists.
    The production of O2 from the photosynthetic activity of early bacteria.
    The production of O2 from cellular respiration in animals.
    The liberation of O2 from deep-sea volcanic vents.
asked May 19, 2013 in Biology by anonymous
    

1 Answer

0 votes
The production of O2 from the photosynthetic activity of early bacteria.
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)



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