An invasive species is one that is not native to a particular ecosystem, but it has the ability to grow, reproduce, and flourish in these new conditions. Invasive species are often introduced to an ecosystem by humans. Many plants were brought over by horticulturalists and they became invasive and dangerous to the natural population over time. If left unchecked, invasive species can lead to the death, and even extinction, of native species. Which of these characteristics would classify an introduced species as being invasive?