Very Low Levels of Oxygen Slowed Evolution of Complex Life on Earth

November 3, 2014 3:00 PM

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Why did it take so long for animals to evolve on Earth? Scientists say this was due to oxygen deficiency.

The advent of complex animal life on the Earth started to flourish over 800 million years ago during the end of Proterozoic period. For about a billion years before this period, life existed but only with very simple organisms.

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