What occurred during the columbian exchange?
a. people from africa were brought to europe.
b. millions of american indians died of disease.
c. horses and cattle went from africa to europe.
d. potatoes and tomatoes were introduced in the americas.

The correct answer is B. Millions of American Indians died during the Columbian Exchange, due to the fact that the food and animals that entered into America from Europe generated diseases because they did not have the necessary antibodies to consume them. For example, almost 30% of the American Indians died from smallpox a few years after the Europeans started to bring their products to the continent.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.

martin luther believed that selling indulgences was wrong and gave people a license to sin. the roman catholic church used the practice of indulgences to raise money for major building projects.