In the columbian exchange, the old world and the new exchanged
a. animal, plant, and microbial life forms
b. technologies
c. religious beliefs
d. polotocal systems
e. scientific theories

A. Animal, plant and microbial life forms.

The rest of the elements were merely changed from the New world traditions and social customs, to the Old ones. Religion, technologies, political systems and scientific knowledge from the aborigins was almost completely disregarded.

While some products that were only produced in the American continent started to be consumed and brought back to Europe (the potatoe, for example)

In order to help the student expand his/her knowledge I will help answer the question. This in hope that the student will get a piece of knowledge that will help him/her through his/her homework or future tests.

In the Columbian Exchange, the old world and the new world exchanged animal, plant and microbial life forms. The correct choice is letter

A. Animal, plant, and microbial life forms 
 
I hope it helps, Regards.      

The answer should be d.

Yea where are the options?