i think that there should be three parts but it should be divided likewise:
first - period before the existence of human civilization
second- period after the human civilization but before the invention of writing
third - period after the invention of writing.
because study of first is more difficult among them because of lack of evidence ,and comparatively easier then the first , as we move forward the amount of evidence needed to understand them increases.
Conventional Historical Periods
AP World History typically divides history into periods based on significant changes in human societies and civilizations, rather than just the availability of evidence.
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