In addition to testosterone, the neurotransmitter serotonin and the hormones called glucocorticoids are also involved in the expression of aggressive behavior. Summers and Winter (2006) have suggested that prior to the beginning of a fight, especially one between two lizards or two fish, the dominant animal tends to show
A) high levels of both.
B) high levels of serotonin and low levels of glucocorticoids.
C) low levels of both.
D) low levels of serotonin and high levels of glucocorticoids.

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The Answer of In addition to testosterone, the neurotransmitter serotonin and the hormones called glucocorticoids are also involved in the expression of aggressive behavior. Summers and Winter (2006) have suggested that prior to the beginning of a fight, especially one between two lizards or two fish, the dominant animal tends to show
A) high levels of both.
B) high levels of serotonin and low levels of glucocorticoids.
C) low levels of both.
D) low levels of serotonin and high levels of glucocorticoids.

In Addition to Testosterone, the Neurotransmitter Serotonin and the Hormones