I believe that the answer is a
They lived together in good conditions, and only the parents worked on the farm.
Answer:
It is called the fertile crescent because of it's close proximity to many water sources. The abundant source of fresh water caused the soil to be unusually fertile for the area and allowed for farming.
Among Mexico's major products and exports are oil (Mexico has a huge oil industry, controlled by the state-owned PEMEX, Petroleos Mexicanos) vehicles, electronics, and other machines, such as pumps, medical and technical equipment, etc.