Answer:
John Deere's improved on Jothero Wood plow because he made a plow that had replaceable parts, but John Deere made a plow that he invented. His plow was a lightweight steel plow. But each plow had an heavy iron or wooden handles that was held on by slow-moving oxen's, or a horse. But they mostly used Horses back than because the Horses can get the field plowed quicklier than the slow-moving oxens.