More or Less Diversity?

August 14, 2013 9:43 PM

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Extinctions are occurring at a phenomenal rate these days. As our climate changes and environments are altered, species are disappearing from our planet. Now, scientists are examining mass extinctions more closely. They've discovered how after these events in the past, species and ecosystems managed to recover in the aftermath.

About 252 million years ago, there was a mass extinction at the end of the Permian Period. At that time, as many as 90 percent of marine organisms and 70 percent of terrestrial species became extinct. The resulting impacts on the ecosystem were huge. The survivors of this event defined species devel...

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