Aroman contribution to architecture

Widespread use of concrete.

Explanation:

Roman contribution to architecture is remarkable.

One of the main contributions of Romans to architecture is the use of concrete.

Roman architects realised that concrete could be made locally.

They realized that concrete has the qualities of:

This brought a revolution to the architectural field that even the emperor set a budget for concrete.

answer; i believe the correct answer is norming;

answer; genetics;