![](http://static.ddmcdn.com/gif/invasive-species-laurentia-450-million-years-250.jpg)
The formation of mountains 450 million years ago may have
allowed invasive species to storm the continent that gave rise to North
America.
![](http://static.ddmcdn.com/gif/blogs/dnews-files-2013-09-Menu-SMALL.jpg)
The abundance of fishes on restaurant menus provide clues to
the quantities of fish species in the ocean.
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