You are presented with the question "What does a porcupine do with its spines when it's threatened?" and the following answer choices: 
- killing insects
 - Shoot them
 - kill them
 - protect them
 - Extend them
 - Shed them
 - Retract them
 - behave

Now knowing that threatening behavior by predators causes a porcupine to extend its quills and puffers are smooth skinned while Porcupines have the characteristic spines or quills, choose the best answer.


 

     Extend them    