The Key To Biodiversity Is Geography. Charles Darwin understood as much in 1857 as he was puzzling over the flora and fauna of the Galapagos Islands on his way to writing On the Origin of Species. "One of the subjects on which I have been experimentising & which cost me much trouble, is the means of distribution of all organic beings found on oceanic islands," he wrote to a colleague. Why, he wondered, are certain animals and plants where they are? What makes a place biologically unique?
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