Which of the following was not exchanged in the columbian exchange?

a. plants

c. animals

b. people

d. silk

The correct answer is D. Silk.

All of the other answer choices were part of the Colombian Exchange. For example, the New World gave the Old World items such as tobacco plants and quinine. Another example would be the Old World introducing animals like horses, sheep, and pigs to the New World. During the Colombian Exchange, people also exchanged new ideas and styles of living.