Helmets can prevent a serious injuries. Not all teen use them, however. Find out how many sports related injuries occurs among teens each year. Write an article for the school or community newspaper encouraging teens to use protective gear

Estimated head injuries in teens during high-risk sports activities:  

- Football: 31,300

- Basketball: 20,200

- Cycling: 19,000

- Soccer: 12,700

- Baseball: 12,100

- Softball: 12,100

- Swimming: 9,200

- Trampolines: 7,900

- Skateboards: 3,100

Explanation:

In the United States, it has been estimated that between 1.7 and 3.8 million traumatic head injuries occur each year. In teens, many of these injuries are produced in high-risk sports, and there is an important proportion that might be prevented by using helmets and other protective equipment. Recent studies have estimated that about 21% of all head injuries are related to sports accidents in American children and adolescents. Head trauma may lead to severe consequences (including traumatic brain injury), thereby it is imperative to use protective equipment.

what effect does exercise have on the nervous system?

the answer is c.