An increased reliance on stone tool use by early homo is thought to be related to evolution of teaching and language.
Hominin reliance on oldowan stone tool which appear from 2.5 mya and are believed to have been socially transmitted. They are hypothesized to have led to the evolution of teaching and language.
Homo sapiens made stone tools such as flakes, scrapers and points during probable first appearance of early sapiens.
Early humans made tools of stone because it was easily available in nature. Stone is a hard substance, thus, could be used as a weapon.
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