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Which of the following was a classic pseudoscientific theory that related bumps on the head to personality traits, and did not disappear until well into the twentieth century?
Phenylalanine
An essential amino acid that the human body cannot synthesize and must be obtained through diet, important for the biosynthesis of other proteins.
Testosterone Replacement Therapy
A treatment for men with low testosterone levels involving the supplementation of testosterone.
XYY Male
A male individual with an extra Y chromosome, characterized by a condition known as XYY syndrome, often associated with tall stature but with few other symptoms.
Klinefelter Syndrome
A genetic condition affecting males characterized by the presence of an extra X chromosome, leading to various physical, developmental, and reproductive difficulties.
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