It is D because my science class had just went over that
The Columbian exchange is a term to refer to the exchange that occurred between the New World and the Old World (Asia, Africa, and Europe) between the XV and XVI centuries in which they were transferred:
- Agricultural products
- Animals
- Technological advances
- Diseases
- Slaves of African origin
This exchange included the arrival of diseases, slaves from Africa, seeds of external plants, animals, and tools and gadgets for various purposes to the New World from the Old World. On the other hand, the Europeans took from America natural resources and precious metals such as gold and silver for their territory.
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The labor movement in the United States grew out of the need to protect the common interest of workers.For those in the industrial sector, organized labor unions fought for better wages, reasonable hours and safer working conditions
HistoryGuy. Control of the Atlantic Ocean was essential to Great Britain's success in World War II because D. Britain was an island nation dependent "on shipping for the supplies it needed." Without access to Atlantic shipping lanes, Britain would have starved and been without war supplies from the Americans. (hope this helps )