Select all that apply. Which of the following were Roman architectural innovations? barrel vaults ...

squared arches ...

concrete ...

rounded pillars ...

windows that let in light ...

Barrel vaults

Concrete

Windows that let in light.

Explanation:

The architecture of Ancient Rome is an important legacy of Roman civilization to the western world. Although sometimes considered to be derived from Greek architecture, it differed in its own characteristics. Barrel vaults, concrete (or the way Romans used it) and windows that let in light were some of the differences we can find between the Roman and Greek architecture. In this way, the Romans introduced new materials in architecture, such as the use of cement, as well as new techniques. The arch, unknown to the Greeks, was an innovation of the Romans, used mainly in buildings designed to commemorate the great military victories.

It was barrel vaults, concrete, and windows that let in light. I am 100% sure this is right cause I had this question and I got it right