Why do even positive changes in families cause stress?

Achild was brought to the hospital with complaints of fever. the vital signs of the child show a temperature of 102° f. on diagnosis, the child is found to have developed exanthema subitum. which drug administered to the child with this communicable disease reduces the body temperature?

Why would a smoker tend to inhale more deeply and smoke more cigarettes when he or she switches to low nicotine cigarettes

In which book word demography is used for first time