Teenage girls begin to menstruate at a younger age if they've had a stressful childhood. This is an example of epigenesist.

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Epigenesist refers to the way that environmental factors interact with genetic material to shape the development of an organism. Studies have shown that high levels of stress in childhood can alter the timing of puberty, with girls experiencing their first menstruation earlier than expected. This is an example of epigenetic factors influencing the expression of genetic information.

Teenage Girls Begin to Menstruate at a Younger Age If