One of the main differences between descent groups and nuclear families is that members of .
a. descent groups are called affines, while members of nuclear families are consanguines.
b. descent groups are permanent, while nuclear families are not.
c. descent groups are typically not involved with politics, while nuclear families are.
d. nuclear families are always exogamous, while descent groups are always endogamous.
e. nuclear families are found only in industrial societies, while descent groups are found only in foraging societies.