Census of modern organisms reveals echo of ancient mass extinction

Paleontologists can still hear the echo of the death knell that drove the dinosaurs and many other organisms to extinction following an asteroid collision at the end of the Cretaceous Period 65 million years ago.

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<p><a href="http://www.physorg.com/news153065721.html">Census of modern organisms reveals echo of ancient mass extinction</a></p> <p>Paleontologists can still hear the echo of the death knell that drove the dinosaurs and many other organisms to extinction following an asteroid collision at the end of the Cretaceous Period 65 million years ago.</p>