Question

why was the columbian exchange considered a major environmental event in world history? it introduced new plants, animals, and farming methods that changed landscapes, but only in the americas. it introduced new plants, animals, and farming methods that changed landscapes on both sides of the atlantic. it introduced new plants, animals, and farming methods that changed landscapes, but only in europe. it had little effect on the natural environment of any continent.

Explanation:

The Columbian Exchange involved the transfer of species, technologies, etc. between the Americas and the Old World (Europe, Africa, Asia). So it impacted landscapes on both sides of the Atlantic (Americas and Europe/Africa/Asia), not just one region. The first option is wrong as it's not "only in the Americas", the third is wrong (not "only in Europe"), and the fourth is wrong as it had significant environmental effects.

Answer:

B. It introduced new plants, animals, and farming methods that changed landscapes on both sides of the Atlantic.