Among the Yanomamo, "sisters" or female relatives are exchanged between groups. This example illustrates which function of marriage?

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This example illustrates the function of creating new social relationships for allies and trade. By exchanging "sisters" or female relatives between groups, the Yanomamo are able to forge alliances, establish trade relationships, and strengthen social bonds between different groups.

Among the Yanomamo, "Sisters" or Female Relatives Are Exchanged Between