In the United States,the average age of menarche
A)has increased rapidly over the last century.
B)has declined significantly since the mid-nineteenth century.
C)is likely to decrease substantially in the coming decades.
D)has remained unchanged over the last century,except for a slight increase in the incidence of precocious puberty.

Question

Quizplus · Accepted Answer

The average age of menarche in the United States has declined significantly since the mid-nineteenth century due to factors such as improved nutrition and health care.

In the United States,the Average Age of Menarche