Why is it useful for historians to base certain studies on the analysis of historical periods

he major historical themes apply only to certain civilizations during certain periods. b. the ideas that characterize a particular period are unaffected by ideas from other periods. ... experience has confirmed the analyzing periods is the most effective approach to history.

Explanation:

the catholic church withhold people's access to the bible during the middle ages.

people could go to church and listen to the teachings, but it was absolutely forbidden to own and/or read the books of both the old and new testaments. it was also prohibited to translate the books (which where originally in biblical hebrew) to any other language.

this was done so the church could remain in control of what their teachings were and to enhance their importance and power, while also being able to judge people's actions through information that was unavailable for the general public.

b: to eliminate competition from other farmers