Final answer:
When a pest infestation occurs, it is often possible to smell it due to the release of chemical compounds called pheromones. The smell of a cockroach infestation, for example, is often described as a peculiar odor.
Step-by-step explanation:
When a pest infestation has occurred, it is often possible to smell it. For example, the smell of a cockroach infestation is often described as a peculiar odor. This is because pests like cockroaches release chemical compounds called pheromones, which can be detected by humans and serve as a warning sign of an infestation.