Which of the following marital customs functions to maintain distinctions between groups?

Question

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Endogamy is the practice of marrying within one's own social or cultural group, and it functions to maintain distinctions between groups by ensuring that individuals only marry within their own group. The other options (progeny price, levirate, sororate, and sororal polygyny) relate to specific forms of marriage exchange or partner selection and do not necessarily maintain distinctions between groups.

Which of the Following Marital Customs Functions to Maintain Distinctions