Final answer:
In Nepal and Tibet, the practice of fraternal polyandry serves as a safety net for a wife, where brothers share the roles of husband and provider to prevent the division of land and limit population growth.
Step-by-step explanation:
In Nepal and Tibet, the form of marriage known as fraternal polyandry provides a safety net for a wife. This arrangement involves one woman being married to multiple husbands, usually brothers, who take turns in providing for the family and working the land. While one husband may work on the family farm, another might work in an urban area to earn cash. This practice is beneficial in societies with scarce resources, as it prevents the division of family land and minimizes population growth, which is crucial in densely populated regions with limited arable land.
Polyandry is a type of marriage where a woman has more than one husband. In this form of marriage, one husband works on the family farm while the second husband works in an urban area to earn cash money. This form of marriage is practiced by a minority of mainly rural families in Nepal.