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The 5 Worst Mass Extinctions in History
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=FlUes_NPa6M
In this unsettling episode of SciShow, Hank takes us on a trip through time to revisit the 5 major mass extinction events that have impacted species over the Earth's history. You'll be sure to leave this episode with some thoughts about what could possibly be the sixth event—the one caused by human activities. Let's go! • Like SciShow on Facebook: / scishow • Follow SciShow on Twitter: / scishow • References for this episode can be found in the Google document here: http://bit.ly/KOHsM5
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