2020 EN-LS2-4

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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.

Environmental Science (EN) Ecosystems: Interactions, Energy, and Dynamics
EN.LS2.4 Use mathematical representations to support claims for the cycling of matter and flow of energy among organisms in an ecosystem.
Clarification Statement: Emphasis is on using a mathematical model of stored energy in biomass to describe the transfer of energy from one trophic level to another and that matter and energy are conserved as matter cycles and energy flows through ecosystems. Emphasis is on atoms and molecules such as carbon, oxygen, hydrogen, and nitrogen being conserved as they move through an ecosystem.
Assessment Boundary: The assessment should provide evidence of students’ abilities to develop and use energy pyramids, food chains, food webs, and other models from data sets.
Science and Engineering Practices	Disciplinary Core Ideas	Crosscutting Concepts
Using Mathematics and Computational Thinking Use mathematical representation to describe and/or support scientific conclusions.	Cycles of Matter and Energy Transfer in Ecosystems Ecosystems have carrying Plants or algae form the lowest level of the food chain. At each link upward in a food web, only a small fraction of the matter consumed at the lower level is transferred upward to produce growth and release energy in cellular respiration at the higher level. Given this inefficiency, there are generally fewer organisms at higher levels of a food web. Some matter reacts to release energy for life functions, some matter is stored in newly made structures, and much is discarded. The chemical elements that make up the molecules of organisms pass through food webs and into and out of the atmosphere and soil, and they are combined and recombined in different ways. At each link in an ecosystem, matter and energy are conserved.	Energy and Matter Energy cannot be created or destroyed. It only moves between one place to another, between objects and/or fields, or between systems.
Connections to other Performance Expectations in Environmental Science
Interdependent Relationships and Dynamics of Ecosystems