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

November 3, 2014 8:08 PM

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

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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