Question

Describe the distinct differences between lineages, clans, moieties, and phratries are all types of decent groups.
Lineage is a descent group that can demonstrate their common descent from a known apical ancestor.
Clan is a descent group that claims common descent from an apical ancestor (but often cannot demonstrate it, or "stipulated descent").
Moieties is a descent group that coexists with only one other descent group within a society
Phratries is a descent group composed of two or more clans each of whose apical ancestors are descended

Answer 1

If marriage is a universal concept, why is it practiced so diversely?

Answer 2

Two people living together and forming a household is the essence of marriage.