Research on the onset of puberty has revealed that:
A) white girls tend to develop breasts at younger ages than do black girls.
B) the average age at puberty is increasing in Europe and North America.
C) changes in the timing of puberty have been caused by hormones in food.
D) menarche depends on a critical level of body fat.

Question

Quizplus · Accepted Answer

Menarche, the onset of menstruation, is influenced by body fat. Specifically, a critical level of body fat is necessary to trigger the hormonal changes that lead to menarche. As such, girls who are undernourished or have low body fat may experience delayed onset of puberty.

Research on the Onset of Puberty Has Revealed That