This lesson plan by New Visions for Public Schools is part of a larger unit called “Ecosystems and Invasive Species” within a one year course called The Living Environment. Each lesson is part of a unit storyline that helps students engage in three-dimensional learning as they make sense of the anchor phenomenon - the zebra mussel invasion into the Hudson River ecosystem. In this lesson, students explore how ecosystems change over time and how ecosystems respond to disturbances. Each lesson may be used alone using a different investigative phenomenon. The lesson follows the 5E model (Engage, Explore, Explain, Elaborate, and Evaluate) and is expected to take 5-8 days. Teachers can select options, such as how groups are formed or the order of the instructional sequence, within each part of the lesson to achieve instructional goals. Extensive instructional support, student handouts, and a final performance assessment task are provided.