Over a period of 22 years, Huesmann, Eron, and Yarmel (1987)measured aggression in a sample of males and females. They found that aggression levels began to crystallize around the age of ____________ and remained stable into adulthood.

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The study by Huesmann, Eron, and Yarmel (1987) found that aggression levels began to crystallize around the age of 8 and remained stable into adulthood.

Over a Period of 22 Years, Huesmann, Eron, and Yarmel