You are presented with the question "what is adrenaline a response to?" and the following answer choices: 
- earthquakes
 - water
 - magnetism
 - threats
 - Heart rate
 - hormones
 - threatened
 - heat

Now knowing that threatening behavior causes a fight-or-flight response in animals and adrenaline is for emergency use only in a fight and flight situation, choose the best answer.


 

    threats     