Why was animal evolution so delayed? Earth was low on oxygen

November 3, 2014 8:08 PM

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New research reveals that early Earth may have had less oxygen than originally thought. This could be the big reason why there is a billion-year gap between the introduction of simple life and the development of complex animal life.(Photo : Ra'ike)

New research reveals that early Earth may have had less oxygen than originally thought. This could be the big reason why there is a billion-year gap between the introduction of simple life and the development of complex animal life.

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