For an animal to respond to a pheromone, it must:

A) have a specific receptor.
B) be able to see it coming.
C) be able to smell it with its nose.
D) have a thin epidermis or hair so it can penetrate.
E) be of the opposite sex of the individual from which it was produced.

Specific Receptor

Specific Receptor refers to a protein molecule that receives and responds to a specific substance or signal, such as a neurotransmitter or hormone, by initiating a specific cellular response.

Pheromone

Chemical substances secreted by animals that influence the behavior or physiology of others of the same species, often related to reproductive signals.