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APOD: June 4, 1996 - Impact! 65 Million Years Ago In addition to having the right age, the crater is consistent with the impact of an asteroid of sufficient size (6 to 12 miles wide) to cause the global disruptions Regardless of the true cause of the K-T event, it is fortunate that such impacts are presently believed to happen only about once every 100 million years!
New proto-mammal fossil sheds light on evolution of earliest . . . New proto-mammal fossil sheds light on evolution of earliest mammals August 7, 2013 A newly discovered fossil reveals the evolutionary adaptations of a 165-million-year-old proto-mammal, providing evidence that traits such as hair and fur originated well before the rise of the first true mammals
Nearly Half of South Americas Mammals Came From North . . . Nearly Half of South America’s Mammals Came From North America New Research May Explain Why The many species that had been evolving in isolation from one another on both continents began
What impact have past famines had on the health of modern . . . Although there was a large demographic change, there was minimal impact on the genetic structure of the country, 2 and no major impacts have been identified But whether there are subtle genetic effects that persist is difficult to say This famine happened so long ago that it is difficult to study directly