Jennifer’s children have always been short when compared to their classmates. one day her son blurted out, "i can’t wait until i’m in college because i’ll be really tall by then! " her daughter chimed in with, "me, too! " jennifer knew she needed to tell them that after puberty:

Both her son and daughter will be shorter than their classmates.

Explanation:

According to the given information, both the son and daughter of Jennifer are shorter than their classmates. The onset of puberty (10-14 yrs for girls and 12-16 yrs for boys) is marked by the exit from the growth phase and the beginning of the reproductive phase.  

Humans exhibit exclusive growth and reproductive phages in the life cycle. Before the onset of puberty, growth hormone is released from anterior pituitary which in turn is responsible for is responsible for growth such as an increase in height of children.

Growth hormone directly targets the metabolism and increase the rate of metabolism. It increases the uptake of nutrients from the blood and their storage as proteins and DNA for growth to support the cell division and deposition of the matrix of bone tissues. The main target of growth hormone is bone and skeletal muscles.  

The onset of puberty is marked by the release of sex hormones in males and females. This is the phase of attainment of sexual maturity and the development of secondary sexual characters. There is no growth of bones and muscles after puberty.

gag reflex, poor dentition, gum retraction

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