This tells us that China was in need of protection, and were willing to take such a huge step for the safety of their empire. We know this is true, as when the wall was built, it was in the middle of the Qin dynasty, and Shi Huangdi wanted to protect China from the Huns. Hope this helped!
<span>A. Sharecropping is the answer i hope this helps you </span><span />
The answer would be D. Al2S3
A renewable resource is infinite (E.X. solar and wind energy) but a non renewable resource will eventually dissapear. (E.X. fossil fuels and coal)