"According to a new study published online in the journal Nature, the ocean may have played a critical role in precipitating many of the world's mass extinctions over the last 500 million years. Specifically, variations in sea level and sediments may have exerted a strong influence on extinction rates and thus molded the past and present composition of marine life, says Shanan Peters, an assistant professor of geology and geophysics at the University of Wisconsin-Madison."http://www.treehugger.com/files/2008/06/sea-levels-extinctions.php
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