Answer:
D. cultivate certain crops
Explanation:
In the Columbian Exchange, Europeans were exposed to new crops that they have never seen before. These included potatoes, corn, sugar, and more. Europeans would bring these new crops back to Europe and begin to use them to their advantage. Heck, potatoes single handedly saved the majority of the European population from starvation.
You put your questions in the wrong category, love. You need to move them to physics.
Commander in chief of the National Revolutionary Army (from which he came to be known as Generalissimo), he led the Northern Expedition from 1926 to 1928, before defeating a coalition of warlords and nominally reunifying China under a new Nationalist government.
