We must look for those cultural bridges to every people group, population segment and cultural environment.

A species under the act can be a true taxonomic species, a subspecies, or in the case of vertebrates, a distinct population segment.

Evidence that the discrete population segment differs markedly from other populations of the species in its genetic characteristics.

In these scenarios, population segments influence one another through changes in their attributes caused by influencing communications.

For messages of health communication to reach selected audiences accurately and quickly, health communication professionals must assemble a collection of superior and audience appropriate information that target population segments.