Amajor architectural development that appeared in roman architecture was the

A major architectural development that appeared in roman architecture was the arch. Romans did not actually invent the arch since arches are present during the prehistoric times, but the Romans have developed ways to use this in order to support the weight of a heavy structure by using concrete. The Romans use this architectural form in making sturdy bridges, longer roads and complex buildings. 

Net  the suffix is your .com/.net/.org, and so on, i believe