What is an operation? A. A way of showing an equality
O B. A process performed with numbers
C. A type of acceleration
O D. Asymbol

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.

the answer to your question is,

old stone age.

-mabel < 3