Q: Fact 1: Male dogs use pheromones in urine to mark their territory. Fact 2: Pheromones are hormones that are thought to stimulate, through smell, sexual reactions in animals. Given the two facts above, what do male dogs use to mark their territory?

Pick from:
A). smell
B). H 2 O
C). love
D). intuition
E). gourdin
F). tongue
G). sight
H). fur
A:
A).