Lack of oxygen delayed the rise of animals on Earth

November 3, 2014 1:15 AM

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Lack of oxygen delayed the rise of animals on Earth

Scientists have long speculated as to why animal species didn't flourish sooner, after adequate oxygen covered Earth's surface. Animals began to prosper at the end of the Proterozoic period, about 800 million years ago -- but what about the billion-year...

Scientists have long speculated as to why animal species didn't flourish sooner, after adequate oxygen covered Earth's surface. Animals began to prosper at the end of the Proterozoic period, about 800 million years ago -- but what about the billion-year stretch prior to that, when most researchers b...

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