Explanation:

- Matriarchal: A social system where females, especially mothers, have the central role in politics, leadership, and moral authority.

- Patriarchal: A society where the male head of the family holds authority over women and children. Traditionally, agrarian societies are often patriarchal.

- Polyandrous: A marriage system where a woman is married to multiple men at the same time. Rare in most societies.

- Polygamy: A marriage system where an individual has more than one spouse simultaneously. It's more prevalent but not specific to agrarian societies.