How life survived Snowball Earth, the planet's most severe ice age - CNN
(CNN)Around 700 million years ago, the world is thought to have experienced its most severe ice age -- a period evocatively described by scientists as Snowball Earth. It threatened the survival of much of the planet's primitive living things, like oxygen-dep… [ 2158 chars]

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Time Stamp 2019-12-03T16:07:00Z