Which earlier civilizations practiced direct democracy?
A: The ancient Athens practiced direct democracy.
Right.
Democracy originated in ancient Greece.
Iceland claims to be the oldest continuous democracy -- over 1,000 years old.
http://www.government.is/how-iceland-is-governed/
Should I include the ancient Greeks as a civilization as well?
Athens was one of the major cities in Greece. Athens is the better answer for your question.
To find out which earlier civilizations practiced direct democracy, you can start by researching known historical civilizations. One notable example of a civilization that practiced direct democracy is Ancient Athens.
Direct democracy can be defined as a form of governance in which citizens have a direct say in decision-making processes. In Ancient Athens, all eligible citizens (adult free males) had the right to participate in the decision-making process, including voting on legislation, proposing laws, and serving as jurors.
To get more information on other civilizations that may have practiced direct democracy, you can consult academic sources, history books, and reliable online resources. Additionally, exploring the democratic systems of other ancient city-states and societies might yield further examples.