News From the Field
"True Grit" Erodes Assumptions About Evolution
March 4, 2013
New work in Argentina, where scientists had previously thought the Earth's first grasslands emerged 38 million years ago, shows the area at the time covered with tropical forests rich with palms, bamboos and gingers. Grit and volcanic ash in those forests could have caused the evolution of teeth in horse-like animals that scientists mistakenly thought were adaptations in response to emerging grasslands.
University of Washington
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