The evidence from studies of twins and biological and adoptive siblings indicates that genetic influences explain approximately percent of individual variations in personality traits.

50%

Explanation: These studies together show that about half (50%) of the variance in aggressive behavior is explained by genetic influences in both males and females, with the remaining 50% of the variance being explained by environmental factors not shared by family members. Form of aggression (reactive, proactive, direct/physical, indirect/relational), method of assessment (laboratory observation, self-report, ratings by parents and teachers), and age of the subjects—all seem to be significant moderators of the magnitude of genetic and environmental influences on aggressive behavior.

answer; i believe the best and correct answer is stronger bonds between the nations of africa;