Answer:
1. The horse collar - allowed for more efficient use of horses in agriculture
2. The three-field system - increased the amount of land available for cultivation
3. The heavy plow - allowed for the cultivation of heavier, more fertile soils
4. The watermill - made it possible to grind grain into flour using water power instead of human labor
5. The horse collar allowed for more efficient use of horses in agriculture, which made it possible for farmers to cultivate larger areas of land and produce more crops. This led to increased food production and a more efficient agricultural system, which in turn helped to support the growth of medieval European society.
6. The three-field system increased the amount of land available for cultivation by dividing land into three fields and rotating crops between them. This allowed for more efficient use of land and led to increased food production, which helped to support the growing population of medieval Europe.
7. The heavy plow allowed for the cultivation of heavier, more fertile soils, which in turn led to increased food production and a more efficient agricultural system. This helped to support the growth of medieval European society.
8. The watermill made it possible to grind grain into flour using water power instead of human labor, which freed up people to engage in other activities and helped to support the growth of medieval European society.