Dead Zones in Coastal Ecosystems is one of a series of Data Point resources from HHMI Biointeractive. Data Points engage students in analyzing and interpreting data from primary literature in the biological sciences. This HHMI Data Point could engage students at the beginning of teaching this performance expectation or as an assessment of the performance expectation. The resource is framed as a discussion starter in which students are asked to evaluate the claims within the Background Information as they analyze the data shown in the map and develop an explanation of that data. The Educator Materials provide background for teachers and a set of discussion questions to guide students toward developing an explanation of how humans impact coastal ecosystems. In this example, students analyze a complex map which uses white dots to show dead zones in the world’s oceans and a color code to show degrees of human impact on land. The map summarizes dead zone data from 42 scientific journals spanning 50 years. The primary source for this Data Point may be found at: http://science.sciencemag.org/content/321/5891/926.full. (Membership to the journal Science is required for access to this link.) Additional information and resources by the authors of the primary source may be found here: http://www.vims.edu/research/topics/dead_zones/index.php.