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The Origin of Complex Life on Earth Just Got a Little Less Mysterious
About 650 million years ago, the Sturtian ice age turned our planet into Snowball Earth. When the planet warmed again, it was plunged into a hothouse phase that unleashed phosphates, oxygen, and other elements necessary to build multicellular life.
Credit: NASA
Life on Earth goes back at least two billion years, but it was only in the last half-billion that it would have been visible to the naked eye.
From Ars Technica
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