What feature does this building have that tells you it is of roman design?

curved dome
square windows
columns
marble

Dome

Explanation:

Domes were a new technology that the Romans developed. It became part of their architectural style alongside with arches, unlike the columns of the Greeks. The Romans were the firsts in all our history to understand the capability that the domes had to the create a large and well-defined interior space.

answer: a tolerated diverse population

explanation: the city of baghdad formed to vast semi- circles on the right and left banks of the tigris twelve miles in a diameter.