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Extinction (Biology) -- Study and teaching

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View Resource NOVA: Last Extinction

What, some ask, was the "last extinction?" It's a fair query indeed, and it happens to be understood as the period approximately 13,000 years ago when large animals were killed off across the North American continent. The exact cause of this extinction remains unknown, but this engaging program offered as part of the long-running NOVA series on public television offers up one particularly...

http://www.pbs.org/wgbh/nova/evolution/last-extinction.html