What are two causes of the secular trend in the decrease in the average age of menarche in Western countries from the mid-19th to the late 20th century?

Name: What are two causes of the secular trend in the decrease in the average age of menarche in Western countries from the mid-19th to the late 20th century?
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The Answer of What are two causes of the secular trend in the decrease in the average age of menarche in Western countries from the mid-19th to the late 20th century?

What Are Two Causes of the Secular Trend in the Decrease