Dramatic shift from simple to complex marine ecosystems occurred 250M years ago at mass extinction

The earth experienced its biggest mass extinction about 250 million years ago, an event that wiped out an estimated 95% of marine species and 70% of land species. New research shows that this mass extinction did more than eliminate species: it fundamentally changed the basic ecology of the world's oceans.

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<p><a href="http://www.physorg.com/news83516876.html">Dramatic shift from simple to complex marine ecosystems occurred 250M years ago at mass extinction</a></p> <p>The earth experienced its biggest mass extinction about 250 million years ago, an event that wiped out an estimated 95% of marine species and 70% of land species. New research shows that this mass extinction did more than eliminate species: it fundamentally changed the basic ecology of the world's oceans.</p>