Oxygen and Evolution

Oxygen and Evolution

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“One of the biggest riddles in Earth’s history is why animals did not evolve after a spike in oxygen levels approximately 2.3 billion years ago. Instead, despite what scientists had thought was a period of relatively high oxygen, the evolution of life on Earth stalled for what is dubbed the ‘boring billion’.” – Jane Qiu, July 14, 2014, Oxygen fluctuations stalled life on Earth, Nature International Weekly Journal of Science

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