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(B) During adolescence,the human body undergoes significant physical and hormonal changes. Sexual maturation in boys is characterized by specific seco

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Cracking of voice

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(B) During adolescence,the human body undergoes significant physical and hormonal changes. Sexual maturation in boys is characterized by specific secondary sexual characteristics. $A$. Loss of milk teeth occurs during childhood,not adolescence. $B$. Cracking of voice (deepening of the voice) is a primary secondary sexual characteristic in boys caused by the enlargement of the larynx under the influence of testosterone. $C$. Increase in height occurs in both boys and girls during adolescence,but it is a general growth spurt rather than a specific sign of sexual maturation. $D$. Weight gain is a general physiological change associated with overall growth and development,not specifically sexual maturation. Therefore,the correct option is $B$.

During adolescence,several changes occur in the human body. Mark one change associated with sexual maturation in boys.

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