In speaking about the term of "what" instead of "who" it must mean "things". In that context then the answer is diseases that had been unknown to Native Americans. Also, it can mean that horses and the wheel came to the New World, which were benefits. Also, firearms came to the New World as well.
Horses, powder, and diseases came to the new world. This brought not only economic boon, but also hardship at the same time. The horses provided mass transportation, however the diseases plagued the population.
horses, cows and pigs
did vanilla come from the new or old world
Old. Came from China with the orange.
The Columbian Exchange is a term given to the widespread exchange of the animals, plants, culture and human populations, communicable diseases, and ideas between the Old and New Worlds.
yes
None, No major animals were discovered and brought back to the old world. Though many plants and foodstuffs such as potatoes, beans, tomatoes, and squash.
The era where many plants, animals, diseases, and people were exchanged between the Old World and New World was called the Columbian Exchange.
Guinea pigs are brought from the new world from early philosofers for study! They then found that their droppings were great for fertilizing plants to make the vegetables grow faster and larger than before.
Yes.
The chocolate was brought from the New World to the Old World after 1492. After that the Mayans and the Aztecs of Central America had been Cultivating it .
The plants is native to both worlds, but the modern cultivated varieties were developed (bread) from New world stock, perversely in the Old world.
Superior technology from the old world and a lack of resistance by new world peoples to diseases brought to them from the old world. (The latter being the greatest factor).
boats lost, planes crashing
horses, cows and pigs
Disease came with the Europeans. The old world brought diseases to the new world and they had no natural immunity to them.
Christopher Columbus introduced horses, sugar plants, and disease to the New World, while facilitating the introduction of New World commodities like sugar, tobacco, chocolate, and potatoes to the Old World. The process by which commodities, people, and diseases crossed the Atlantic is known as the Columbian Exchange.
Some species of plants and animals flourished in both areas, and some did not. There were many new animals and plants in the Americas that Europeans had never seen. And, Europeans brought plants and animals to the New World that America had never seen. The Colombian Exchange was also a cultural exchange. New agricultural developments were traded, economic activity and opportunities opened up between the New and Old Worlds, and new ideas were exchanged.