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Dancing Bear in the club
This survey did not collect data on gynecomastia, voice change, undescended testes, or facial hair growth. Cancel anytime. Log in or sign up to add this lesson to a Custom Course. The increased secretion of testosterone from the secondary sex characteristics in males during puberty causes the male secondary sexual characteristics to be manifested. Only a few studies in the United States have examined racial differences in the age of onset of secondary sexual characteristics in boys.