It promoted the (relatively) rapid diffusion of immigrants, language, and domesticated crops and animals. Those factors are examined in excellent detail in Jared Diamond's book, "Germ, Guns and Steel" which I highly recommend for anyone studying the development of world cultures. It's a long read, but well worth it.
Answer: the destruction of distance
Explanation: it doesn't make sense ^
Answer:
I have had this.... the answser is A, just did it
Explanation: