Which statement regarding populations is true? It is possible to study most ecological processes at the individual level and then extrapolate that data to represent an entire population of organisms. When studying ecology, the terms "populations" and "communities" are interchangeable. Birth rates, death rates, as well as immigration and emigration rates are all features of a population. A population can sometimes consist of individuals of multiple species, living together in the same area. Individuals within a population can undergo evolutionary change.