Fact 1: Threatening behavior causes a fight-or-flight response in animals.

Fact 2: Violence threatens everyone.

Given the two facts above, answer the question "What does violence cause?" with the following options: 
- Fight-or-flight response
 - life
 - luck
 - fun
 - a lot of human deaths
 - get chemical reactions started
 - a tree falling
 - population movement


 

 Fight-or-flight response        