Final answer:
The three farming systems were crop rotation, metal plow, and irrigation. Crop rotation involves planting different crops each year in a field to increase yields. The metal plow made it possible to cultivate previously unsuitable areas, and irrigation increased production and quality.
Step-by-step explanation:
The three farming systems were crop rotation, metal plow, and irrigation. Crop rotation involves planting a different crop each year in a field, allowing the soil to regain nutrients and increase overall yields. The metal plow revolutionized farming by making it possible to cultivate previously unsuitable areas. Irrigation, developed in Mesopotamia, organized the watering of crops, leading to increased production and consistent quality.