Weather, local tribes such as local Indians, and viruses
From all the aforementioned, significant periods in Chinese history were marked by the: Shang, Qing and Xia. The answer to your question us 1, 4 and 5. I hope that this is the answer that you were looking for and it has helped you.
Way to much to answer all at once break it up into multiple questions and i would be happy to answer sorry! : /
Answer:
I think it's C, but that's just my guess. I hope you'll pass, and good luck to you!