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2016-06-30T22:57:37+08:00
A cline describes a smooth gradient of adaptive characteristics across a line of organisms. Some of the most dramatic examples of clines in the animal kingdom are the so-called "ring species." These species, such as the Ensatina salamanders of California and the Larus gulls of the arctic, form a cline that reaches around a natural barrier and meets itself on the opposite end
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