What is a common physical change that occurs during adolescence in both boys and girls?

During adolescence, a common physical change that occurs in both boys and girls is the activation of sex organs. This change is part of the broader hormonal changes that occur during puberty, which leads to the development of secondary sexual characteristics and the ability to reproduce. In both genders, this activation triggers a range of physical transformations, such as the development of breasts in girls and the increase of muscle mass in boys, as well as the onset of menstruation in girls and the production of sperm in boys. These changes are critical for sexual maturity and reflect the significant biological developments that occur during this stage of life.

While options like increased height are also true, the activation of sex organs indicates a deeper physiological change linked directly to reproductive health and sexual maturity, making it a key aspect of adolescence. The other options refer to changes that either do not commonly occur or are not directly related to the primary developmental milestones associated with puberty in a universal way for both genders.