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Ancient Fossil Reveals Oldest Known Circulatory System

A fossil creature buried in an "invertebrate version of Pompeii" more than half a billion years ago reveals the first-known cardiovascular system in exquisitely preserved detail. "This is the first preserved vascular system that we know of," said Nicholas Strausfeld, a Regents' Professor of Neuroscience at the University of Arizona's Department of Neuroscience, who helped analyze the find.
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