The age at which the onset of menstruation occurs in girls decreased by about _____ year(s)between the 19th and 20th centuries.
A)1
B)2
C)4
D)6

Question

Quizplus · Accepted Answer

Studies have shown that the age of menarche (onset of menstruation) has decreased by about four years between the 19th and 20th centuries. This is believed to be due to improvements in nutrition and overall health.

The Age at Which the Onset of Menstruation Occurs in Girls