Answer:
1
Explanation:
The rest are wrong b/c it helped <em>expand</em> China rather than isolate it, they didn't use ships on the Silk Road, and it brought better communications, etc. between countries.
Answer: "oasis" .
_______________________________________
I believe that it is Olmec.
Water and wind because they can shape different natural feautures. So water
Renewable: trees, air, water
Nonrenawable: coal, oil, metals
