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Overview: This news brief, from September 2006, reviews a recent case of evolution in action. In just 15 years, mussels have evolved in response to an invasive crab species. Find out how biologists uncovered this example of evolution on double time. Author/Source: UC Museum of Paleontology Grade level: 9-12 Time: 15 minutes Teaching tips: This article includes a set of discussion and extension questions for use in class. It also includes hints about related lessons that might be used in conjunction with this one. Get more tips for using Evo in the News articles in your classroom. Concepts: There is a fit between organisms and their environments, though not always a perfect fit. Traits that confer an advantage may persist in the population and are called adaptations. A hallmark of science is exposing ideas to testing. Scientists test their ideas using multiple lines of evidence. Scientists use multiple research methods (experiments, observational research, comparative research, and modeling) to collect data. Scientists use experimental evidence to study evolutionary processes. Teacher background: Evidence for Evolution Nature of Science Natural Selection

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