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You've traveled 500 million years into the past to experience some of the most dangerous seas and alien organisms ever to exist on Earth. Welcome to the Cambrian Period.
00:00 What If You Lived in the Cambrian Period?
00:38 Cambrian Period
01:54 Cambrian Explosion
04:53 Environment
Do you want to protect endangered species and witness your impact through monthly videos? For the first 200 people to join our friends at Planet Wild, we're offering the first month's subscription for free. Go to and use creator code WHATIF
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