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John has two hours of free time this evening. He ranked his alternatives, first go to a concert, second go to a movie, third study for an economics exam, and fourth answer his e-mail. What is the opportunity cost of attending the concert for John?
Zebra Mussel
An invasive aquatic species known for its rapid population growth and significant impact on freshwater ecosystems and human infrastructure.
Sea Lamprey
A parasitic lamprey native to the Atlantic Ocean, known for its detrimental impact on native fish populations in the Great Lakes where it is an invasive species.
Great Lakes
A group of five large, interconnected freshwater lakes in North America, important for water resources and habitat.
Marine Systems
Complex ecosystems found in oceans and seas that encompass a diverse range of habitats and life forms.
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