Final answer:
Cockroach infestations can be detected by an ammonia-like smell due to the release of chemicals like oleic acid and linoleic acid. These act as pheromones to repel other cockroaches.
Explanation:
Cockroach infestations can often be identified by a distinct smell that is usually described as ammonia-like. This smell is a result of the release of chemicals like oleic acid and linoleic acid by cockroaches upon death, which act as pheromones to prevent other roaches from entering the area.
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