Oxygen, Life May have Appeared Earlier than Thought

Life may have started on Earth much earlier than previously thought, according to new research.

Scientists from the University of Copenhagen and University of British Columbia (UBC) analyzed 3 billion year-old soil in South Africa and say they found evidence that low levels of oxygen had already started to accumulate then. That’s 700 million years earlier than prior estimates. The South African soils are believed to be Earth’s oldest.

Oxygenation of the Earth’s atmosphere began at a dynamic …

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