Zebra mussels were introduced into the Great Lakes by

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Zebra mussels were introduced into the Great Lakes through the ballast water of ships from Europe. The mussels were first discovered in Lake St. Clair in 1988 and have since spread to many waterways in North America. Cleaning fish tanks and pouring water down drains is also a way that invasive species can be spread, but it is not the method by which zebra mussels were introduced to the Great Lakes.

Zebra Mussels Were Introduced into the Great Lakes by