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This was the longest of the thre periods. the hominids learnt to carve stone. these tools are called bifaces
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They perfected making-tools and used smaller stone chips for caving. They began using other materials, like bone, and created new utensils; knives arrowheads, harpoons for fishing, and sewing needles.
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The first spiritual and artistic expression appeared. They have stone figures representing their godess of fertility.
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Copper tools and weapons were very fragile
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Bronze on allow of cooper and tin, was more resistent. They used it to make farming tools and sophisticated weapons.
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Iron was more abundant and resistant tan the previous metal