Ivan Seeking
Nov4-03, 01:50 PM
WASHINGTON (Reuters) -- Low oxygen levels could have triggered two giant extinctions hundreds of millions of years ago, allowing the dinosaurs to reign supreme over the ancestors of mammals, U.S. researchers said.
http://www.cnn.com/2003/TECH/science/11/03/dinosaurs.oxygen.reut/index.html
http://www.cnn.com/2003/TECH/science/11/03/dinosaurs.oxygen.reut/index.html