What two word phrase was used to refer to the transfer in the 15th and 16th centuries of animals, plants, culture, human populations, technology, and ideas between the American and Afro-Eurasian hemispheres?

What two word phrase was used to refer to the transfer in the 15th and 16th centuries of animals, plants, culture, human populations, technology, and ideas between the American and Afro-Eurasian hemispheres?
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