Read the passage below and answer the question.
"Colón [Columbus] and his crew did not voyage alone. They were accompanied by a menagerie of insects, plants, mammals, and microorganisms . . . European expeditions brought cattle, sheep, and horses, along with crops like sugarcane (originally from New Guinea), wheat (from the Middle East), bananas (from Africa), and coffee (also from Africa) . . . "
-From Charles C. Mann, historian, 1493: Uncovering the New World Columbus Created, 2011.
Which of the following processes is Mann describing?