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Paleobiologist Studies How Elevated carbon dioxide Affected Ancient Marine Life: Before the worst mass extinction of life in
Earth's history - 252 million years ago - ocean life was diverse and clam-like organisms called brachiopods dominated. After
the calamity, when little else existed, a different kind of clam-like organism, called a bivalve, took over. A new theory about
how ancient life on Earth responded to elevated CO2 levels may change the way scientists view one of the largest mass
extinctions in history. The theory could also yield clues about the future of present day life on our planet in the face of climate
change. [Source: (Sep 07, 2007) Astrobiology MagazineBased on a University of Wisconsin - Milwaukee news release]
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