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Secondary sexual characteristics are physical traits that emerge during puberty, distinguishing boys and girls, but are not directly involved in reproduction. In boys, puberty typically begins between ages 11 and 15 and is marked by the growth of facial, pubic, and underarm hair, deepening of the voice due to enlargement of the larynx, and increased muscular development. The testes and ______ ________ ________ __________ ______ ___ ________.
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