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Until the middle of the nineteenth century, all peppered moths (biston betularia) observed around manchester, england, were light in color. in 1845, a single black peppered moth was reported. as manchester became more industrialized and dark soot began to cover the bark of the trees, the frequency of black moths increased greatly. the change in proportion of light and dark forms resulted
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c. stabilizing selection.
d. genetic drift.
e. increased mutation
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Until the middle of the nineteenth century, all peppered moths (biston betularia) observed around ma...
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