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Used By: Scott Baker
Added On: 09/24/2017 at 8:00 PM EDT
Image Caption: There have been 5 mass extinctions in Earth's history of life. Are we in a sixth?
Owner Name / Source: (Not Known) Wikipedia
URL of Owners Page: https://en.wikipedia.org/wiki/Extinction_event
Image Source: ImagesAttr
License: Attribution 2.0 Generic
Notes: