The Mongol civilization affected the world by _______,_______,_______?

Question

I please need three things.

Answer 1

If there were no Mongolians, there would be no great wall of china.

Answer 2

You are asking how the largest contiguous empire in history affected the world? Have you done no thinking? not even a simple web search?

Wikipedia is almost always the place to start:
http://en.wikipedia.org/wiki/Mongol_Empire

It will address the obvious: religious toleration, promotion of trade (see their role in the restablishment of the "silk road"), creation of the original pony express, invigoration of China

Less obvious is that a very large percentage of men in the world today are direct lineal descendants of Genghis Khan:
http://en.wikipedia.org/wiki/Descent_from_Genghis_Khan