6. Give three examples of ways invasive species have arrived to the Hudson

Invasive species arrive inadvertently in ship ballast (both solid ballast and ballast water), on wooden shipping pallets, through canals (like the Erie Canal), as unseen 'hitchhikers' on people, animals, or boats, by escaping from agricultural areas, and by people introducing them on purpose, which is often the case .

allowed for the prediction of the properties of missing elements.