When physical characteristics,such as early onset of menstruation or increased height and weight (due to better nutrition),change over the course of several generations,this is an example of a

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A secular trend refers to a long-term change in a population's characteristics, such as height or age at puberty, that occurs over several generations due to environmental factors such as diet and healthcare. This is different from primary and secondary characteristics, which refer to specific physical traits such as eye color or muscle mass, and generational cycles, which refer to patterns of behavior or cultural traditions that are passed down through families over time.

When Physical Characteristics,such as Early Onset of Menstruation or Increased