What book ? if you send the book cover
I think the answer to your question you ask is the letter b. the second to last.
It was much lighter and easier to carry unlike the coins they normally used.
That region experienced a surplus of food. - the best answer. Nile Valley was located near river Nile in Egypt. It was a flood plain defined like a heaven for farmers. There were perfect conditions for people to grow food and obtain water. The river was flooding created conditions to live like that..
