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n. As such, this set of Essential Elements addresses a small number of science standards, representing a breadth, but not depth, of coverage across the entire standards framework. The purpose of the DLM Essential Elements is to build a bridge from the content in the general education science framework to academic expectations for students with the most significant cognitive disabilities. This version of the Essential Elements will provide content for science assessments for at least the next two years. The DLM Science Consortium intends to develop a learning map based on research about how students learn science content and engage in scientific and engineering practices in the next phase of the project. Revisions will be made when the science map is complete, at which time we anticipate the EEs will be aligned to the map with revisions and additions as appropriate.

"What is Ambitious Science Teaching? Great teaching can be learned. This web site provides a vision of ambitious science instruction for elementary, middle school and high school classrooms. Ambitious teaching deliberately aims to support students of all backgrounds to deeply understand science ideas, participate in the activities of the discipline, and solve authentic problems. We feature 4 core sets of teaching practices that support these goals. These core sets make up the Ambitious Science Teaching Framework. The framework has been based on classroom research from the past 30 years-research that has asked, "What kinds of talk, tasks, and tools do students need in order to fully engage in meaningful forms of science learning?""

This web site provides tools and resources that support ambitious science instruction at the middle school and high school levels. Ambitious teaching deliberately aims to get students of all racial, ethnic, and class backgrounds to understand science ideas, participate in the discourses of the discipline, and solve authentic problems. We describe 4 core instructional strategies that support this kind of teaching. These "high-leverage" practices make up the Science Learning Framework (below), and have been selected based on extensive research of how young people learn science, on authentic forms of science activity, and how teachers learn to appropriate new practices.

Symbiotic relationships are interactions between species that live closely with each other and are commonly separated into three types: parasitism, mutualism, and commensalism. Students are often under the impression that these types are distinct and mutually exclusive, but on closer examination some interactions appear to be at times mutualistic, at other times parasitic. Is it perhaps better to think of mutualism and parasitism as two ends of a sliding scale, with commensalism in the middle? In this case study, students consider this question by examining what is often considered to be a classic example of mutualism existing between oxpecker birds and African savanna large mammals. After students examine data from a research study on oxpecker behavior, they then apply a more nuanced understanding of species interactions to a set of additional scenarios. The learning objectives for the case align with the Four-Dimensional Ecology Education Framework. The case was written for an upper-level undergraduate ecology course, but could easily be adapted for an introductory biology course.