Cline
/klˈaɪn/
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Definition
(noun) A gradation in a character or phenotype within a species, deme, or other systematic group.
Sentence Examples
There is a gradual cline of decreasing size to the northward.
As one moves further south they enter a different cline.
CEFR Practice Quiz
A ____ is a gradual change in a character or feature of species.