What happened to many species of organisms 2.5 billion years ago when oxygen began to accumulate in the atmosphere?

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    They retreated into anaerobic environments and extracted energy from food via glycolysis/fermentation.
    They evolved metabolic pathways that could utilize oxygen to drive the electron transport chains of aerobic cellular respiration, making metabolism much more efficient.
    They became extinct.
    All of the above are correct.
asked May 19, 2013 in Biology by anonymous
    

1 Answer

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All of the above are correct.
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)



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