Describe the physical changes occurring in boys and girls.

Adolescence is a critical phase of development that marks the transition from childhood to adulthood, and it is characterized by significant physical changes. These changes, which are influenced by hormonal shifts, can differ between boys and girls, though they share some common features.

In boys, puberty typically begins between the ages of 9 and 14, with a marked increase in testosterone production. One of the first noticeable physical changes is the enlargement of the testes and the growth of pubic hair. Following this, boys experience a rapid increase in height, often referred to as the "growth spurt," which can last for several years. The growth plates in the long bones begin to fuse, marking the end of vertical growth. Along with the height increase, boys also experience an increase in muscle mass, which is facilitated by the surge ____ _________ _________ ________ _______ ________.
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