Why should you use a control during an experiment? to maintain order to provide a greater certainty that the observed results are not by chance to keep data to have an interesting experiment that is easily repeated

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances

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.