Did Rising Oxygen Levels Fuel Mammal Evolution?

Posted on October 1, 2005 

Did Rising Oxygen Levels Fuel Mammal Evolution?

Humans and other mammals have flourished on Earth, and one important change in their environment may help explain why: a large increase in the concentration of atmospheric oxygen.

Writing in the current issue of Science, researchers report that over the past 205 million years the concentration of oxygen in the air has more than doubled.

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