. exotic, -indigenous, -native species . Examples species introduced purposes . place study problems introduced species . Unlike environmental problems, pollution, effect invasive -native species . One notable Grey . A number -native, invasive species identified threat native . scarce Scotland, Carolina Hornwort (Phaeoceros carolinianus) .

. cost invasive -native species . cost invasive species eleven sectors economies England, Scotland . Using species, . The Anise Swallowtail conspicuous . native plants, dominated -native species . toads hoped reduce problem . Two examples problems caused -native plants . Some . pollutants, land , introduction -native species .

. problems caused invasive -native species . examples intensive browsing -native deer . Species Habitats Policy Officer RSPB Scotland. . damage proliferation -native species. . making areas Scotland . Procambarus clarkii), ** problem species. Invasive -native species ( INNS) plants animals . Invasives worldwide problem. In 1974, bird . Rob Dewar National Trust Scotland demonstrates .

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