Answer:
The answer is the fertile floodplains were good places to grow food.
Explanation:
Making the shift into cultivation, many of the earliest human settlements were create close to a river. Floodplains are flat they are easier to be cultivated to grow crops or raise animals. The sediment deposited by a river during a flood helps plants to grow in the future because it increases fertility of the soil. The water from the river is also essential for drinking, cleaning and cooking for humans. Rivers were used for transport and a food source also. These first settlers also needed the other plants that grew naturally in the fertile floodplains for building, fuel and food.
