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The term invasive species refers to a subset of introduced species or non-indigenous species that are rapidly expanding outside of their native range. Invasive species can alter ecological relationships among native species and can affect ecosystem function and human health. A species is regarded as invasive if it: (1) has been introduced by human action to a location where it did not previously occur naturally, (2) becomes capable of establishing a breeding population in the new location without further intervention by humans, and (3) spreads widely throughout the new location. In simple terms, an invader has to (1) arrive, (2) survive, and (3) thrive.