Final answer:
Anthropological research on polyandry is most extensive in Nepal, where fraternal polyandry is a cultural norm that mitigates resource scarcity and population growth.
Step-by-step explanation:
Polyandry has been researched most often by anthropologists in areas of Nepal, where fraternal polyandry is practiced as a cultural norm. This form of marriage is most common in Nepal due to the scarcity of resources and the need to keep family land intact. Brothers share a wife, which allows the family to live on their land collectively, and helps to minimize population growth in resource-scarce areas. While polyandry is rare globally, occurring in approximately 1 percent of cultures according to Altman and Ginat (1996), it is a subject of interest due to its unique family structure and its implications on societal norms.