You are presented with the quiz "What do the pheromones in male dog urine used for?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "male dogs use pheromones in urine to mark their territory" and "for a male, urine markings are used to define the boundaries of their territory". 

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


 

  define boundaries         