You are presented with the question "What uses chemicals in urine to mark their territory?" and the following answer choices: 
- rabbit
 - bears
 - viruses
 - male dogs
 - alpacas
 - athletes
 - humans
 - bacteria

Now knowing that male dogs use pheromones in urine to mark their territory and pheromones are chemicals produced by insects to communicate, choose the best answer.


 

    male dogs     