Question

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

Answer 1

C. differences in genes.

Attached vs. free earlobes is an inherited trait determined by genetic variation (a simple Mendelian trait), not by diet, environment, or personality.