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Puberty Began for Molly When She Was 9 Years Old

Question 31

Multiple Choice

Puberty began for Molly when she was 9 years old.Her mother began puberty at 11 years.For her grandmother,the onset was at 13 years of age.These changes in the age of the onset of puberty over time are referred to as a _____ trend.


A) cross-sectional
B) sexual
C) physiologic
D) secular

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