What is the only type of chemical signal that is not intended to alter the physiology of the animal producing that signal?

Question

Quizplus · Accepted Answer

Pheromones are chemical signals that are intended to communicate with others of the same species, but they are not produced to alter the physiology of the animal producing the signal. Instead, pheromones can be used for a variety of purposes, such as attracting a mate, marking territory, or signaling alarm.

What Is the Only Type of Chemical Signal That Is