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In the 4.5 billion year history of Earth, a mere 10 million years seems rather insignificant, the equivalent of two months in the life of a 75 year-old man. Yet, during a 10 to 20 million year stretch of time, beginning about 540 million years ago, life evolved at an explosive rate. Scientists call the period the "Cambrian Explosion."
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- verified Status: Ended
- person By: Unknown
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- tag Season: Season 1
- timer Episode Runtime: 52 Mins
- star Rating: 0 / 10
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