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Surprising species-level extinction millions of years ago may have reached as high as 92% Plants that grew in both the Cretaceous and Paleogene periods. January 11, 2021 The asteroid impact 66 million years ago that ushered in a mass extinction and ended the dinosaurs also killed off many of the plants they relied on for food. Fossil leaf assemblages from Patagonia suggest that vegetation in South America suffered great losses but rebounded quickly, according to researchers funded by the U.S. National Science Foundation. The results of the study, the first of its kind in the Southern Hemisphere, appear in the journal Every mass extinction event is like a reset button, and what happens after that reset depends on which organisms survive and how they shape the biosphere, said Elena Stiles of the University of Washington. All the biodiversity that we observe today is related to the organisms that made it past the last big reset 66 million years ago.

United statesChristopher schneiderPeter wilfElena stilesDivision of environmental biologyUniversity of washingtonResearch newsNsfpublic affairsUs national science foundationSouth americaSouthern hemispherePenn stateNorthern hemisphereNorth americaNational science foundationஒன்றுபட்டது மாநிலங்களில்