Final answer:
Democracy was the key political structure that emerged in Greece during the classical era, exemplified by the Classical Athenian democracy with its emphasis on civic participation and rule of law.
Explanation:
Democracy was the important political structure that originated in Greece during the classical era. The Classical Athenian democracy, developed in fourth century BCE, was characterized by civic participation, voting rights, legislative bodies like the ekklesia and law-courts, constitution writing, and the rule of law.
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