TIL there were four mass extinction events before the one that killed the Dinosaurs. The most severe killed a staggering 97% of all species. All life on Earth today is descended from the 3% that survived.

http://www.nhm.ac.uk/nature-online/life/dinosaurs-other-extinct-creatures/mass-extinctions/



Submitted February 17, 2015 at 05:00AM by HipHopAnonymous23 http://www.reddit.com/r/todayilearned/comments/2w4r0b/til_there_were_four_mass_extinction_events_before/