You are presented with the question "threatening behavior causes" and the following answer choices: 
- to move people
 - population movement
 - adrenaline to surge
 - hypothyroidism
 - a pathogens
 - Plant growth is reduced
 - Greenhouse gasses
 - hyperthyroidism

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      