A (a)   is a society that has cities, a well organized government, and workers with specialized job skills.

As the (a)   evolved, letter shapes gradually changed into a very flexible writing system that resembles the one we use today.

(a)   is the transfer of ideas or customs from one culture to another.

(a)   is stories, myths, and legends that are passed on by word of mouth from generation to generation.

Early civilizations developed near (a)   which provided food, water, transportation, trade, and irrigation.

(a)   are human-made objects (tools, jewelry, toys, and coins) that teach about the customs and beliefs of people of the past.

(a)   is history that took place before the development of writing.

Stone Age hunter-gatherers were (a)   ; they moved from place to place gathering food with the seasons.

Scientists debate whether Homo sapiens began a large (a)   to other regions of the world or independently evolved over time.