During the past century and a half, the average age of menarche in the United States has plummeted. This phenomenon is an example of

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The decline in the average age of menarche in the United States over the past century and a half is an example of a secular trend in development, which refers to patterns of change observed over several generations. This trend is influenced by various factors including nutrition, health, and overall living conditions.

During the Past Century and a Half, the Average Age