New research reveals oxygen's contributions to evolution

It's common knowledge that humans and other animals couldn't survive without oxygen. But scientists are now learning a good deal more about the extent of our evolutionary debt to a substance that was once a deadly poison.

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<p><a href="http://www.physorg.com/news12068.html">New research reveals oxygen's contributions to evolution</a></p> <p>It's common knowledge that humans and other animals couldn't survive without oxygen. But scientists are now learning a good deal more about the extent of our evolutionary debt to a substance that was once a deadly poison.</p>