According to the Constitution, laws passed by Congress must be approved by "the President," although it is possible for a law to pass without such approval, if there are enough votes in Congress.
Answer:
C. gunpowder
Explanation:
gunpowder
And maybe the biggest single innovation that changed the world, for better or worse, was the use of gunpowder, which there's some use in the late Tang, but it really starts to get perfected during the Song Dynasty. The Song Dynasty is eventually overthrown in the 13th century by the Mongols.
