Final answer:
The nuclear family is most common in industrial and middle class societies and in foraging bands, where geography mobility and flexibility are important due to economic and subsistence lifestyles.
Step-by-step explanation:
The nuclear family, which consists of one or two parents and their immediate offspring, is most common in certain types of societies. Specifically, the nuclear family is prevalent in industrial and middle class societies, as well as in foraging bands. These societal structures value geographic mobility, which is compatible with the smaller and more mobile family unit of the nuclear family. Industrial and market societies tend to be organized around smaller family units due to the demands of a market economy, which often requires families to relocate for work opportunities. Foraging bands also exhibit the nuclear family structure frequently because their subsistence lifestyle necessitates mobility and flexibility.