Question

Choose all that apply. What are three characteristics of the Great Wall of China? 1world’s longest humanmade structure at more than four thousand miles
2 actually constructed from a series of smaller walls that were connected together 3completed by the Qing Dynasty
4 built to guard against Mongol invaders
5 located along the southern border of China

Answer 1

I know for a fact that it was build to guard against the mongols, i'm not so sure about these two tho.  It's the longest human made structure at more than four thousand miles, I want to say that two is also applicable

So the answers are 1,2,4