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 intended to communicate with individuals of the same species, but they are not intended to alter the physiology of the animal producing the signal. Instead, pheromones are used for social or reproductive purposes, such as attracting mates, marking territories, or signaling danger.

What Is the Only Type of Chemical Signal That Is