In 1999, the National Football League (NFL) began allowing teams to challenge officials' calls using instant replay. Why do you think this continues to be a controversial rule? What are the pros and cons?

Which of the following was a major outcome of european imperialism in africa after the industrial revolution? o a. the area around the suez canal experienced decades of military conflict o b. africans in the belgian congo suffered forced labor and oppression o c. the discovery of rich matural resources led to african economic prosperity. o d. europeans brought disease to central africa, killing thousands.