Earth
Oxygen may have helped complex life arise a billion years early
Earth’s air suddenly got a lot more oxygen around 1.6 billion years ago and that could have triggered the evolution of large multicellular organisms
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Earth’s air suddenly got a lot more oxygen around 1.6 billion years ago and that could have triggered the evolution of large multicellular organisms
Lee Berger’s stunning discoveries of huge caches of ancient bones are overturning ideas about our origins, but not everyone likes his methods