An invasive species invasive species
An invasive species is any plant or animal that has spread or been introduced into a new area where they are, or could, cause harm to the environment, economy, or human, animal, or plant health. Their unwelcome presence can destroy ecosystems and cost millions of dollars.

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is one that is not native to an ecosystem and which causes, or likely causes, economic or environmental harm or harm to humans. It is important to note that we are talking about environmental boundaries. 



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