I have experiences this in my own life when I join my schools reading Olympics team and we all had to learn an part of each book we were given because if one of us didn't have the answer we needed to be able to help each other out
Answer:
That means the person who told you that answer is not smart....
Answer:
Growing a surplus of food
using irrigation in farming
trading between city-States
being located near rivers
Explanation:
Just answered the question on Clever
Charles Babbage was the inventor
