This resource provides students with a current problem in nature- deterioration of coral reef systems- and a sample of real world data from a scientist who is developing potential solutions to the problem. While considering the phenomenon of how corals compete with algae for living space, students address the question, How does the presence of sea urchins affect coral populations?” Using background information and authentic scientific data, students graph and analyze data to show how the presence of sea urchins affects the health and population of corals. Teacher background and data are provided as well as three differentiated options for graphing. Students will use the data as evidence to develop a claim substantiated by the data. Additionally, students will explain the reasons why the evidence supports their claim.