What is the basis of our knowledge of early communal societies that existed tens of thousands of years ago?

Question

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Archaeologists examine artifacts found in early dwellings and graves to learn about early communal societies. Through the discovery of tools, pottery, architecture, human remains, and other material artifacts, archaeologists can piece together a picture of how these societies lived, worked and related to each other. Myths and folklore (A) may provide some insight into early communal societies but cannot be relied upon as a primary source of knowledge. Religious leaders (C) may have played a role in shaping early communal societies but we have no evidence that they recorded their histories on cave walls. Scholars (D) likewise have no prehistoric documents to study or translate.

What Is the Basis of Our Knowledge of Early Communal