Answer the following question: Fact 1: Male dogs use pheromones in urine to mark their territory. Fact 2: Generally, pheromones are volatile substances. Given the two facts above, answer the question "Male dogs use what in their urine to mark their territory?" with the following options: - hydrocarbons - volatile substances - kinetic energy - an area swollen with pus - Chemical energy - competing for resources - add a solute - Positive charges
Answer:
volatile substances