Question

which of the following is a result of the columbian exchange?
horses and cows were introduced to europe.
europeans and native americans exchanged scientific knowledge.
native americans became predominately christian.
diseases killed much of the native population of the americas.

Explanation:

• For the option "Horses and cows were introduced to Europe": Horses and cows were already in Europe; the Columbian Exchange introduced them to the Americas, so this is incorrect.
• For the option "Europeans and Native Americans exchanged scientific knowledge": There was not a significant exchange of scientific knowledge in the Columbian Exchange context; it was more about goods, animals, diseases, and cultures (with a heavy religious component from Europe to Americas), so this is incorrect.
• For the option "Native Americans became predominately Christian": While Christianity was spread to Native Americans, the Columbian Exchange's most direct and impactful result on population was disease, and "predominately Christian" is not the most defining result of the Columbian Exchange compared to the disease impact.
• For the option "Diseases killed much of the native population of the Americas": The Columbian Exchange involved the transfer of diseases like smallpox from Europe to the Americas. Native Americans had no immunity to these diseases, leading to a massive decline in their population. This is a well - known and major result of the Columbian Exchange.

Answer:

D. Diseases killed much of the native population of the Americas