Final answer:
Olfactory indicators are volatile chemicals that bind to receptor proteins in olfactory neurons and stimulate the sense of smell. An example is the smell of a rose.
Step-by-step explanation:
Olfactory indicators refer to volatile chemicals that bind to receptor proteins in olfactory neurons and stimulate the sense of smell. These odorant molecules can be mixtures of different molecules, and the brain integrates the signals generated by each molecule in the mixture to detect an odorant.
An example of an olfactory indicator is the smell of a rose. The volatile chemicals released by a rose bind to receptor proteins in our olfactory neurons, which then send signals to the olfactory bulb of the brain, allowing us to perceive the familiar fragrance of a rose.