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, cows and pigs
Several significant items were brought from the New World to the Old World during the Columbian Exchange, including crops such as potatoes, tomatoes, maize (corn), and cacao (used for chocolate). Additionally, tobacco became highly popular in Europe. These introductions transformed agricultural practices, diets, and economies across the Old World, leading to profound cultural and social changes.
did vanilla come from the new or old world
The Columbian Exchange facilitated the transfer of various foods between the New World and the Old World. The New World introduced crops such as maize (corn), potatoes, tomatoes, and cacao to Europe, Africa, and Asia. In return, the Old World brought wheat, rice, sugarcane, and coffee to the Americas. This exchange significantly impacted diets and agricultural practices across both regions.
Butter originates from the Old World, specifically Europe, where dairy farming and butter-making practices were developed. During the Columbian Exchange, which began in the late 15th century, European settlers brought butter and dairy farming techniques to the New World. Consequently, while butter itself is from the Old World, it was introduced and became part of the culinary practices in the New World through this exchange.
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.
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.
The era where many plants, animals, diseases, and people were exchanged between the Old World and New World was called the Columbian Exchange.
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 .
Yes.
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.