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Secondary sex characteristics are features that appear during puberty, distinguishing males and females, but are not directly involved in reproduction. In males, these characteristics include deepening of the voice, growth of facial and body hair, increased muscle mass, broadening of shoulders, and enlargement of the larynx. The primary hormone responsible for these changes is __________ ____ _________ ____ _________ ____ _______ _________ __________ ___ ______.
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