Final answer:
Descent groups are permanent social units based on shared ancestry that provide identity and support to members.
Explanation:
Descent groups are relationships that provide members with a sense of identity and social support based on ties of shared ancestry. These groups are permanent social units where members claim a common ancestry, such as in clans or matrilineal or patrilineal descent groups. They play a crucial role in defining individuals' place within their society and are a significant aspect of kinship systems across various cultures.
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