Question 7 (1 point) About 5000 years ago, carly farmers in the Indus Valley invented an agricultural tool that was pulled by oxen to break up the soil before farmers planted their crops. Which of the following explains the importance of the improvements to this innovation during the Second Agricultural Revolution? The cast iron plow patented in the United States in the late eighteenth century represented the first major improvernent in agricultural technology in 2000 years. The mechanical reaper invented in the United States in the early nineteenth century was the first agricultural innovation that was pulled by a tractor rather than by horses. The seed drill invented in England in the early eighteenth century was the first agricultural machine with moving parts. The steel plow patented in the United States in the mid-nineteenth century was the first commercially successful plow in the world. The agricultural scythe that cut wide swaths of grain during harvest time provided work for farm laborers.