Invasive species

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An invasive species is an introduced species that harms its new environment. Invasive species adversely affect habitats and bioregions, causing ecological, environmental, and/or economic damage. Since the 20th century, invasive species have become serious economic, social, and environmental threats worldwide. Invasion of long-established ecosystems by organisms is a natural phenomenon, but human-facilitated introductions have greatly increased the rate, scale, and geographic range of invasion. For millennia, humans have served as both accidental and deliberate dispersal agents, beginning with their earliest migrations, accelerating in the Age of Discovery, and accelerating again with the spread of international trade. Notable plant species that are invasive in many parts of the world include the kudzu vine (Pueraria), water hyacinth (Pontederia crassipes), common ragweed (Ambrosia artemisiifolia), and yellow starthistle (Centaurea solstitialis). Notable animal species that are invasive...

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