Which of the following resulted from a genetic variation that was favored by natural selection? A. cancer in a lab rat B. the long neck of a giraffe C. the small size of a Chihuahua D. smoothness of a

Which of the following resulted from a genetic variation that was favored by natural selection?

A. cancer in a lab rat
B. the long neck of a giraffe
C. the small size of a Chihuahua
D. smoothness of a river rock

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