Invasive species, or nonnative species, are mostly a result of an increase in human mobility. As people began traveling the world they began bringing nonnative species with them. Often they are in the form of a disease, like smallpox, which killed many Native Americans when Europeans came to the new world. Many species are brought abroad intentionally like the Asian carp and kudzu, which was brought over to control soil erosion. Often nonnative ornamental plants escape into the surrounding wild environment and choke out native plants. GMO (genetically modified organisms) crops have been known to invade surrounding wild plants spreading their genes to native organisms. In most part, introduction of invasive species is due to human activity.
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