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9 / 25  What is a cline?
A  the slope of a mountain where a population lives
B  the degree to which a mutation helps an individual survive
C  the number of individuals in the population
D  gradual geographic variation across an ecological gradient

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Source:  OpenStax, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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