Mass extinction study provides lessons for modern world
The Cretaceous Period of Earth history ended with a mass extinction that wiped out numerous species, most famously the dinosaurs. A new study now finds that the structure of North American ecosystems made the extinction worse than it might have been. Researchers at the University of Chicago, the California Academy of Sciences and the Field Museum of Natural History will publish their findings Oct. 29 online in the Proceedings of the National Academy of Sciences.
The mountain-sized asteroid that left the now-buried Chicxulub impact crater on the coast of Mexico's Yucatan ...

