Major causes of open head injuries in the United States include ...

[sammy]

Major causes of open head injuries in the United States include
 
  a. boxing and playing football.
 b. gunshot wounds and skull fractures.
  c. playing soccer.
 d. aneurysms.

Question 2

Closed head injuries, or concussions, are characterized by
 
  a. injury without penetration of the skull.
 b. lack of a coup and countercoup.
 c. penetration of the skull.
 d. no loss of consciousness.

[randomguy133]

Answer to Question 1

b

Answer to Question 2

a