Some people have attached ear lobes and some people have free ear lobes. The differences in these traits are caused by A. differences in personality. B. differences in genes. C. differences in diet. D.

Some people have attached ear lobes and some people have free ear lobes. The differences in these traits are caused by A. differences in personality. B. differences in genes. C. differences in diet. D. differences in environment.

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Some people have attached ear lobes and some people have free ear lobes. The differences in these traits are caused by A. differences in personality. B. differences in genes. C.…

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