What is one result of the columbian exchange that still exists in the americas today? a- irrigation is used as a farming technique in argentina. b- brazil is one of the largest coffee producers in the world. c- maize is the most important crop in south america. d- the mayan religion is practiced throughout central america.

b. Brazil is one of the largest coffee producers in the world is one result of the Columbian Exchange that still exists in the Americas today.

The Columbian Exchange refers to the transfer of animals, plants, and culture by Christopher Columbus during in voyage.  

It was only during the early 1700s (through Columbian Exchange), that the crop of coffee made its arrival in the Brazilian fields. Coffee was not cultivated in Brazil prior to that.

Within a period of a few decades, Brazil came to be recognized as the largest producer of coffee in the world.  

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