Confusion occurs when an event affects both. There is evidence that TNT adversely affects male fertility. It affects predominantly young adults, causing acute hepatitis. Killing sharks negatively affects the marine ecosystem. It usually affects female children more severely than males. The disease affects men and women equally. It affects males more often than females. Poverty often drastically affects children's success in school. It affects models from 2014 onward and could cause a fire. It mostly affects problems with abstract content. The secondary form usually affects older people. It mostly affects the young and elderly. Exposure to pesticides also affects spermatogenesis. Pragmatics is the study of how context affects meaning. In Africa, it primarily affects adolescents and young adults.