Stable food supply: A complex can thrive only if its member have enough food.

Social structure: Social structure include different jobs and social levels. People at higher levels have greater status than others.

A highly developed culture: This includes things such as painting, architecture, music and literature.

A system of government: A system of government is needed to direct people’s behavior and make life orderly.

A religious system: A set of beliefs, usually in a god, together with forms of worship.

Advances in technology: They must have created practical tools and inventions.

A highly developed written language: There must be some form of written language within the civilization.

1. Stable food supply: A complex can thrive only if its member have enough food.

2. Social structure: Social structure include different jobs and social levels. People at higher levels have greater status than others.

3. A highly developed culture: This includes things such as painting, architecture, music and literature.

4. A system of government: A system of government is needed to direct people’s behavior and make life orderly.

5. A religious system: A set of beliefs, usually in a god, together with forms of worship.

6. Advances in technology: They must have created practical tools and inventions.

7. A highly developed written language: There must be some form of written language within the civilization.