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HS-LS2-3

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HS-LS2-3 Ecosystems: Interactions, Energy, & Dynamics
Students who demonstrate understanding can: Construct and revise an explanation based on evidence for the cycling of matter and flow of energy in aerobic and anaerobic conditions.
Clarification Statement: Emphasis is on conceptual understanding of the role of aerobic and anaerobic respiration in different environments (e.g., chemosynthetic bacteria, yeast, and muscle cells).
Assessment Boundary: Assessment does not include the specific chemical processes of either aerobic or anaerobic respiration.
Crosscutting Concepts	Science & Engineering Practices	Disciplinary Core Ideas
Energy and Matter: Energy drives the cycling of matter within and between systems.	Constructing Explanations (for science) and Designing Solutions (for engineering): Constructing explanations and designing solutions in 9–12 builds on K–8 experiences and progresses to explanations and designs that are supported by multiple and independent student- generated sources of evidence consistent with scientific ideas, principles, and theories. Construct and revise an explanation based on valid and reliable evidence obtained from a variety of sources (including students’ own investigations, models, theories, simulations, peer review) and the assumption that theories and laws that describe the natural world operate today as they did in the past and will continue to do so in the future.	Cycles of Matter and Energy Transfer in Ecosystems: Photosynthesis and cellular respiration (including anaerobic processes) provide most of the energy for life processes.