You are presented with the quiz "What does a porcupine do with its spines when it's threatened?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says 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". 

So, what's the best answer to the question?


 

     Extend them      