During the period of European external expansion,the introduction of plants and animals flowed from the Europe to the Americas,but not in the reverse direction.

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The Columbian Exchange involved the two-way transfer of plants, animals, and diseases between the Americas and Europe/Africa/Asia. For example, the Americas introduced crops such as maize, potatoes, and tomatoes to Europe, while Europe introduced wheat, horses, and cattle to the Americas.

During the Period of European External Expansion,the Introduction of Plants