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The Origin of Complex Life on Earth Just Got a Little Less Mysterious

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Snowball Earth

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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