Question

Twin studies most clearly indicate that ________ exert(s) a strong influence on the development of our unique personality traits.

Answer 1

person-to-person genetic variations

Step-by-step explanation:

Using twins as research subjects is a powerful method for examining genetic and environmental influences on individual differences in behavior and personality traits. Many studies and research involving twins and the influence that genetic variations have proven that the personality of each twin is not only influenced by the environment in which each twin was raised, but genetic variations from person to person strongly influence the development of our traits. Unique personality.

Answer 2

The answer is Fraternal twins. This twins usually don't look like exactly the same because they don't share the same genetic material, they can't be distinguished as twins.  This type of twins grow and born together in the womb from a unique fertilized egg.