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Average Heights of American Men and Women Have Increased Steadily

Question 86

Multiple Choice

Average heights of American men and women have increased steadily since the 1940s.The best explanation for this observation is that height is


A) a polygenic trait.
B) influenced by an X-linked gene.
C) influenced by environmental changes like improvements in diet.
D) influenced by a Y-linked gene.
E) influenced by crossing over.

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