You are presented with the question "What behavior causes a fight-or-flight response in those in the Animalia kingdom?" and the following answer choices: 
- some mammals
 - insects
 - bullfrogs
 - reproductive
 - nurturing
 - threatening
 - foraging
 - hypothyroidism

Now knowing that threatening behavior causes a fight-or-flight response in animals and all animals, including fish, are in the Animalia kingdom, choose the best answer.


 

      threatening   