The statement 'research indicates that high serotonin levels may increase aggression' is FALSE.
Serotonin is a chemical messenger (i.e., a hormone) used to transmit messages through the body.
In conclusion, the statement 'research indicates that high serotonin levels may increase aggression' is FALSE.
Learn more on serotonin here:
https://brainly.com/question/5394922
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