The correct answer is: "they started trading with neighboring communities".
The first stage of an agricultural society is characterized by a subsistence agricultural economy, in which everybody in the community contributes to production activities. Once they are able to develop better farming techniques, the amount produced increases and production surpluses are generated. These surpluses are the amount that is not necessary for self-subsistence and that can be traded in exchange for other commodities.
When trade steps in, it means that there are different types of products in the economy. Division of labor and speacialization appear at this point, when different tasks need to be done to produce each good, and different people work on each of them. Some people continue doing the agricultural work, others are in charge of the trading activities, and some others become artisans which construct tools that continue improving the production techniques and generating more surpluses.
I don't remember a lot, but it's mostly about people surviving the big dust storm and a family's struggle to survive in it, mostly.
Glad I could help, and good luck!
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i would have to agree because the writer is explaining that if you dont rember the past then its bound to happen again in you mind or you would suddenly remember it. hope this helps
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