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An invasive species is a non-native organism that spreads rapidly and causes harm to the environment, economy, or human health. Unlike other introduced species, invasives outcompete native flora and fauna, damage ecosystems, and can spread diseases.Key Characteristics to be defined as "invasive," an organism must meet two strict criteria:It is non-native: Introduced to an ecosystem outside its historical, natural range, usually due to human activity (either accidentally or intentionally).It causes harm: Its unchecked growth negatively impacts native biodiversity, agricultural yields, infrastructure, or public health