Final answer:
The term used to describe the transfer of plants, animals, and humans between the Old and New Worlds following Columbus's voyage is the 'Columbian Exchange'.
Step-by-step explanation:
The term historians use to describe the reciprocal transfer of plants, animals, and humans between the Old World and New Worlds is the Columbian Exchange. This phenomenon began with the voyages of Christopher Columbus in 1492 and represents a significant event in global history.
Through the Columbian Exchange, crops like maize, potatoes, and cassava were introduced from America to Europe, Africa, and Asia, transforming diets and fostering population growth. Simultaneously, European animals such as pigs, cattle, and sheep were brought to the Americas, along with various diseases which had a devastating impact on indigenous populations.
The exchange wasn't limited to flora and fauna; it also included the transfer of cultures, technology, and ideas, which reshaped civilizations on both sides of the Atlantic.
The term historians use to describe the reciprocal transfer of plants, animals, and humans between the Old and New Worlds is the ___.