Question

which structure did the aztecs and the incas have in common?
a collection of city - states that fought for dominance
a coalition of city - states that developed trade alliances
a group of tribes that were unified under one religion
a social class system that was organized like a pyramid

Explanation:

The Aztec and Inca civilizations both had rigid, pyramid-shaped social hierarchies: at the top were rulers/elites, followed by nobles, artisans, farmers, and enslaved people at the bottom. The other options do not apply: the Incas had a centralized empire (not competing city-states or trade coalitions), and while religion was important, neither was unified only by a single religion across all tribes.

Answer:

a social class system that was organized like a pyramid