The formation of mountains 450 million years ago may have allowed invasive species to storm the continent that gave rise to North America.
via Discovery News http://news.discovery.com/earth/rocks-fossils/invasive-species-450-million-years-ago-130903.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/rocks-fossils/invasive-species-450-million-years-ago-130903.htm#mkcpgn=rssnws1
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