You are presented with the question "An animal attacking another animal may cause" and the following answer choices: 
- dopamine to increase
 - hypothyroidism
 - cause their death
 - decrease stamina
 - adrenaline to surge
 - population movement
 - insulin decrease
 - growth hormone production

Now knowing that threatening behavior causes a fight-or-flight response in animals and fear also causes adrenaline to surge, which is part of the fight or flight response, choose the best answer.


 

     adrenaline to surge    