Evolution Extinction 5of6

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=aNsej6y-Ixc

Some 99.9% of all species that have ever lived on earth are now extinct. Extinction! explores why, then confronts a frightening notion: Are humans causing the next mass extinction - the sixth in the history of life on earth? • Make sure to check all the other resources at • http://www.pbs.org/wgbh/evolution/

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