The Oklahoma Academic Standards for Science (OAS-S) are three-dimensional performance expectations representing the things students should know, understand, and be able to do to be proficient in science and engineering. Performance expectations are considered standards and include a science and engineering practice (indicated in blue and represent everyday skills of scientists and engineers), disciplinary core ideas (represented in orange and represent science ideas used by scientists and engineers), and a crosscutting concept (indicated in green and represent ways of thinking like scientists and engineers).
Each dimension in the OAS-S grows in complexity and sophistication across the grades. To learn more about the prior knowledge and skills students have developed (or future knowledge/skills) associated with that specific dimension, each section in the standard below is hyperlinked to that specific vertical learning progression page.
7th Grade (7) Ecosystems: Interactions, Energy, and Dynamics |
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7.LS2.3 Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.
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Clarification Statement: Emphasis is on describing the conservation of matter and flow of energy into and out of various ecosystems, and on defining the boundaries of the system. |
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Assessment Boundary: Assessment does not include the use of chemical reactions to describe the processes. |
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Science and Engineering Practices |
Disciplinary Core Ideas |
Crosscutting Concepts |
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Cycle of Matter and Energy Transfer in Ecosystems
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Connections to other Performance Expectations in Grade 7 |
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Cycling of Energy and Matter |
Grade 7 Science Standards and Bundle Analyses
3D Science Vertical Learning Progressions
OKScience Frameworks Introduction