life on earth change during the Old Stone Age beginning around 40000 years ago because many think humans have been around for over 40 times
The Stone Age was the earliest time when human beings began makingtools and arrowheads out of rock. They used a knapping process ofbreaking away pieces of rock to shape the tool. Bones were alsoused for some tools. Humans became better hunters. Also, changeswere made including social changes, more stable use of agriculturalresources and so on.

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