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EDITORIAL: The Isthmus of Chignecto hangs on by a thread
The narrow slice of marshland that connects Nova Scotia to New Brunswick is a fragile thread that allows for roughly $35 ...
PBS3mon
Allopatric Speciation:
Nancy Knowlton of the Smithsonian Tropical Research Institute in Panama ... She and her colleagues found that shrimp on one side of the isthmus appeared almost identical to those on the other ...