Eustress: m<span>oderate psychological stress interpreted as being beneficial for the experiencer.</span>
Your lymph nodes or "thymus" promotes the maturation of t cells.
Explanation:
The 47,XXY karyotype of Klinefelter syndrome spontaneously arises when paired X chromosomes fail to separate (nondisjunction in stage I or II of meiosis, during oogenesis or spermatogenesis
A. your hypothesis needs to be testable