Football Players Common Back Injuries Can You Please Answer These Questions On Canadian Football?

Can you please answer these questions on Canadian football? - football players common back injuries

1. As the relationship with the Canadian football is played in other countries?
2.How has the game of Canadian football has changed since it was invented?
3.Why football injuries are so frequent?
4, the wages of Canadian football players wages can "be compared to other Canadian athletes in football?
5.Why Football is a people's sport to watch?
6.Why the CFL (Canadian Football League) makes costs them more popular in the United States?

Please answer as much as you can. Please, I am doing research for my PE students at work. I really appreciate.
Please,
Charlotte