Early humans were nomadic hunter-gatherers from before 10,000 BCE. Around 10,000 BCE, some began farming, living in permanent villages, and domesticating animals, marking the start of the Neolithic Period. Eight features define civilizations, including cities, governments, religion, job specialization, social classes, art/architecture, public works, and writing. The first cities formed in Africa and Asia where rich soil allowed not all to be farmers, leading to job specialization within cities. Cities developed infrastructure like canals and dams to control floods and needed leadership and bureaucracy to govern as some grew very powerful. Early civilizations ranked social classes from priests/nobles to slaves based on jobs. Writing evolved from pict