divided archeological period into paleolithic(savage , hunter and gatherer), Mesolithic , neolithic(barbarism,agriculturist) , copper age, bronze age(civilization, metal and script user) and iron age :check:
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1st revolution - neolithic , rural revolution
2nd revolution - bronze age,urban revolution.
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culture ideas got diffused to less adequate environments - 2* civilization. argued , thru enculturation and innovations variations passed to next generations