How can the size of the industrial/service sector and the agriculture employment rate indicate the level of industrialization?

A larger industrial and service sector, and a larger number of people working outside of agriculture, can indicate a higher level of industrialization in the economy.

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i need more info !

it depends on which society you are referring to. many civilization performed rituals so the gods would with their growing season but the most well known is that of the aztecs. they would make sacrifices, usually animals, but sometimes humans as well.