Answer:
it's the great wall of china
During formal discussion, mental notes could help you maintain your focus/attention for the point that given by another speaker so you could give your opinion or counter argument later.
This will give the impression that you're an attentive and a competent person.
Answer: Horses. Riding on horses in battle or just finding a place to settle would have been much easier than walking. So, the were helpful in battle and they were helpful to nomads.
Explanation:
