Broadly speaking, the hormone that is most often associated with aggressive behavior in both humans and lower animals is:

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Testosterone is a hormone that is primarily associated with the development of male reproductive tissues and secondary sexual characteristics. However, it has also been linked to increased levels of aggression in both humans and lower animals. Studies have found that testosterone levels are often higher in individuals who exhibit more aggressive behaviors, and hormone replacement therapy using testosterone has been shown to increase aggressive tendencies in both men and women.

Broadly Speaking, the Hormone That Is Most Often Associated with Aggressive