For many years, ________ was believed to be the sole cause of aggression. More recently, researchers have investigated other causes.

Question

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Frustration was believed to be the sole cause of aggression for many years, but recent research has shown that other factors such as cognitive, environmental, and physiological factors also play a role. Low self-esteem, parental neglect, and a lack of social skills may contribute to aggression, but they are not the sole cause.

For Many Years, ________ Was Believed to Be the Sole