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Which statement below best describes the way the term "Columbian Exchange" applies to changes in the ecology of the Americas?- The introduction of European plants and animals significantly changed the ecology of the Americas.- New American crops improved the health of Europeans and spurred a dramatic increase in the population of Europe.- Infectious diseases killed 80 to 90 percent of the early European settlers who came to the Americas.- European explorers changed the names of most of the physical features in the Americas, eliminating earlier Indian names.- The interbreeding of Europeans with native Indians created a new racial and ethnic human population in the Americas.

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