A unilineal kinship system is based on only one line of descent, either through the father's line (patrilineal) or through the mother's line (matrilineal). In patrilineal societies, descent, inheritance, and roles are traced through the father's line, while in matrilineal societies, they are traced through the mother's line.
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Homo habilis is considered to be the direct ancestor of Homo erectus in the line of human evolution.
A relative refers to any person related to you by blood or marriage, such as parents, siblings, aunts, uncles, cousins, etc. An ancestor specifically refers to someone who is part of your direct line of descent, like your grandparents, great-grandparents, etc. In other words, all ancestors are relatives, but not all relatives are ancestors.
Patriarchal societies have origins in various ancient civilizations, such as Mesopotamia, Egypt, and ancient Greece. These societies were typically structured around male dominance and inheritance passing through the male line, impacting social, political, and economic systems. The roots of patriarchy can be traced back to early human history, evolving alongside agricultural and pastoralist societies.
The International Date Line is an imaginary line that follows the 180° meridian. This line is drawn in a way that it avoids landmasses to prevent dividing countries or regions. The poles were chosen as the line's endpoints to have the least impact on human settlement.
The hominid evolutionary line diverged from the line leading to the great apes about 6-7 million years ago during the Miocene epoch. This divergence gave rise to the common ancestor of both hominids and great apes, leading to the evolution of modern humans and apes along separate paths.