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BBC: There's been much debate about why animals took so long to evolve and thrive on Earth.
Now scientists say it was due to incredibly low levels of oxygen on Earth more than a billion years ago.
A team determined the chemical composition of ancient rocks to find there was about 0.1% of the oxygen levels present compared with today.
The researchers present their work in Science journal.
Why complex life took so long to appear on the scene has puzzled scientists for many years. It was only......
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Low oxygen ‘delayed life on Earth’
Posted by Washington Post: Juliet Eilperin on October 30th, 2014
Posted in Water Conservation