What's the worst extinction in Earth's history?

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  • Arnold, Carrie. "The largest extinction in Earth's history may have been caused by microbes." Scientific American. June 17, 2014. (Jan. 21, 2015) http://www.scientificamerican.com/article/the-largest-extinction-in-earth-s-history-may-have-been-caused-by-microbes/
  • Hoffman, Hillel. "The Permian Extinction: When life nearly came to an end." National Geographic. (Jan. 21, 2015) http://science.nationalgeographic.com/science/prehistoric-world/permian-extinction/#page=1
  • National Geographic. "Mass Extinctions: What causes animal die-offs?" (Jan. 21, 2015) http://science.nationalgeographic.com/science/prehistoric-world/mass-extinction/

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