What physical change is characteristic of adolescence?

The development of secondary sexual characteristics is a defining physical change during adolescence. This stage of development, which typically occurs between the ages of 10 and 19, is marked by significant hormonal changes that lead to the maturation of the reproductive system and the emergence of physical traits associated with gender.

For instance, in females, this includes breast development, the onset of menstruation, and the widening of hips. In males, secondary sexual characteristics involve the growth of facial and body hair, deepening of the voice, and increased muscle mass. These changes are driven primarily by endocrine activity and are crucial for reproductive capability, making them a hallmark of adolescence.

Other options, while relevant to the adolescent experience, do not capture this essential aspect of physical development during this life stage. Stabilization of body weight might occur later in life, especially after the rapid growth spurts of adolescence. A decline in physical activity is often observed in later adolescence or young adulthood rather than characterizing the puberty phase. Improvement in bone density can occur during adolescence due to growth spurts and increased physical activity, but it is secondary to the more pronounced development of secondary sexual characteristics during this period.