A single resource economy depends on

A resource-based or natural-resource-based economy is that of a country whose gross national product or gross domestic product to a large extent comes from natural resources.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

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.