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100

Preserved remains of ancient human, animal, or plant.

Fossil

100

A trading system in which people exchange goods directly without using money.

Barter

100

Person who lives by hunting animals and gathering plants.

Hunter-gather 

100

The Mesopotamian system of writing that uses triangular-shaped symbols to stand for ideas or things.

Cuneiform

100

A wide, flat plain between the Tigris and Euphrates rivers in present-day Iraq.

Mesopotamia

200

A state containing several countries or territories.

Empire

200

To supply water.

Irrigate

200

Soldiers who fight while riding horses.

Cavalry

200

Object made by human being.

Artifact

200

Scientist who studies the physical materials of the earth itself, such as soil and rocks.

Geologist

300

A brick, pyramid-shaped Mesopotamian temple.

Ziggurat

300

Worship of many gods or deities.

Polytheism

300

Beliefs, customs, practices, and behavior of a particular nation or group of people.

Culture

300

A set of laws that governed life in the Babylonian Empire.

Hammurabi’s Code

300

Money that is used as a medium of exchange, usually bills or coins.

Currency

400

Something that can be used as proof.

Evidence

400

Scientists who study human life in the past by examining the things that people left behind.

Archaeologist

400

To control or strongly influence.

Govern

400

Time before humans invented writing.

Prehistory

400

An independent state consisting of a city and its surrounding territory.

City-state

500

An independent state that works with other states to achieve a shared military or political goal.

Ally

500

A payment or gift to a stronger power.

Tribute

500

A grand stone pillar.

Stele

500

An idea that all members of a society—even the rich and powerful—must obey the law.

Rule of Law

500

Study of humankind in all aspects, especially development and culture.

Anthropology