An extinct arthropod, Fuxianhuia protensa, from the Cambrian period, had a sophisticated heart and blood vessel system ...
http://news.discovery.com/earth/rocks-fossils/520-million-year-old-fos
An extinct arthropod, Fuxianhuia protensa, from the Cambrian period, had a sophisticated heart and blood vessel system ...
http://news.discovery.com/earth/rocks-fossils/520-million-year-old-fos
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