Globalization causes many things to happen. For the scientists in this study, globalization has increased the spread of invasive species. If scientists can predict the spread of invasive species, the spread may be slowed or stopped. The question the scientists in this study wanted to answer is: How can scientists better predict the spread of invasive species? Topics: Wildlife, Globalization, Invasive Species, Nonnative, Scales, The Great Lakes, Zebra Mussel.