Kinship studies show us that heredity is a more important determinant of happiness than money and other social factors. What else have these studies shown us?

a. People's levels of cheerfulness or grumpiness are not consistent.
b. Identical twins, separated at birth, and raised by other people, are similar to their natural parents in some traits.
c. There is very little evidence for a genetic role in the appearance of some traits.
d. None of these.


B

Psychology

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