Answer:
D
Explanation:
The Army Mission, our purpose remains constant: To deploy, fight, and win our Nation's wars by providing ready, prompt, and sustained land dominance by Army forces across the full spectrum of conflict as part of the Joint Force.
This is called the Columbian Exchange: the exchange of species and populations between the Old and the New World, including some diseases, plants as tomato and potato and animals.
Please could you indicate what changes are there discussed by the text