Male dogs use what in their urine to mark their territory?\nOptions:\n- (A) hydrocarbons\n- (B) volatile substances\n- (C) kinetic energy\n- (D) an area swollen with pus\n- (E) Chemical energy\n- (F) competing for resources\n- (G) add a solute\n- (H) Positive charges OK. Let's think hard:
User
Male dogs use pheromones in urine to mark their territory. Generally, pheromones are volatile substances. Male dogs use volatile substances in urine to mark their territory.
So, the final answer is (B).
Assistant