the answer is A. the reindeer migrate seasonally. the people need the reindeer to survive, so wherever the reindeer go, they have to go too. so, they wouldn't be able to build permanent settlements.
It was useful because it gave the people a sense for national interest and unity under a single culture, goal, belief, or whatever you may call it. The country was not unified until them and now they could all work together to keep the nation growing.
The answer is Liu yang. hope that helped
Answer:
most migrate to other countries
Explanation:
for example, the UK, poland, moldova, slovakia and other countries bordering it, there is border control at poland
