This is for lesson 6 unit 2 in environmental science b. i really need the answers so i'll post the questions down 1. the single-most important invention to farmers is the a. automobile b. cotton gin c. teacher d. grain solo 2. many modern tractors are equipped with to the tractors harvest the crops. a. gps devices b. steering wheel c. bigger tires d. more seats 3. farming follows the shape of the earth to prevent soil erosion. a. erosion b. contour c. peaks and valleys d. crop rotation