Answer:
the interior Great Wall stretches from Xinzhou in Shanxi Province, via Hebei Province to Beijing Badaling.
i think it was built to double protect the land and the people.
The answer to this statement is B
I believe the answer is:
- Pure mathematics
Proven by the difference in knowledge on astronomy between aztec culture and the Castillian.
- Urban architecture
Proven by the superior irrigation system that Aztec civilization had compared to Castilian civilization at that time.