Which destructive organism was introduced into the Great Lakes and has now spread to most of the major river systems in the central and eastern U.S.?

Question

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The zebra mussel was introduced into the Great Lakes and has now spread to most of the major river systems in the central and eastern U.S. The sea lamprey, round goby, and walking catfish are also invasive species in the Great Lakes, but the zebra mussel has had the most widespread impact in the region.

Which Destructive Organism Was Introduced into the Great Lakes and Has