Puberty began for molly when she was 9 years old. her mother began puberty at 11 and her grandmother at 13. this is an example of a trend.

The answer in the space provided is the secular trend. The secular trend is being referred to children who undergoes puberty in an early stage or an early age. It could be seen above as Molly, her mother and grand mother has shared the same phase of having an early puberty, in which is being referred to as a secular trend.

It would be 3.15 in meters