Fact 1: Male dogs use pheromones in urine to mark their territory.

Fact 2: Pheromones are chemicals produced by insects to communicate.

Given the two facts above, answer the question "What uses chemicals in urine to mark their territory?" with the following options: 
- rabbit
 - bears
 - viruses
 - male dogs
 - alpacas
 - athletes
 - humans
 - bacteria


 

    male dogs     