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2 years ago

In the United States, the average age of menarche has _____ since the mid-nineteenth century.a. Increased marginally

Social Studies

1 answer:

iVinArrow [24]2 years ago

7 0

Answer:

b. Declined significantly

Explanation:

There were some studies of the timming of menarche, From the sixth to the fifteenth centuries in Europe, most women reached menarche on average at about 14, between the ages of 12 and 15, but earlier years studies found that fewer than 10% of U.S. girls start to menstruate before 11 years of age, and 90% of all US girls are menstruating by 13.8 years of age, with a median age of 12.4 years.

Image attached extracted from : Boaz, N.T. (1999): . Essentials of biological anthropology. Prentice Hall, New Jersey,

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