T because i really think its the answer i am not really sure but im going for it....
Answer:
Assuming there's only one answer, i'm guessing it's, A moving dot with a start and a finish point. Hope this helps! PLEASE GIVE ME BRAINLIEST!!!!! =)
There were actually several building techniques that were introduced by the Romans, but perhaps the most important was the bridge building technique that allowed bridges to be built without supports.
