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HS-LS1-3

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HS-LS1-3 From Molecules to Organisms: Structure & Processes
Students who demonstrate understanding can: Plan and conduct an investigation to provide evidence of the importance of maintaining homeostasis in living organisms.
Clarification Statement: A state of homeostasis must be maintained for organisms to remain alive and functional even as external conditions change within some range. Examples of investigations could include heart rate response to exercise, stomate response to moisture and temperature, root development in response to water levels, and cell response to hyper and hypotonic environments.
Assessment Boundary: Assessment does not include the cellular processes involved in the feedback mechanism.
Crosscutting Concepts	Science & Engineering Practices	Disciplinary Core Ideas
Stability and Change: Feedback (negative or positive) can stabilize or destabilize a system.	Planning and Carrying Out Investigations: Planning and carrying out investigations to answer questions or test solutions to problems in 9–12 builds on K–8 experiences and progresses to include investigations that provide evidence for and test conceptual, mathematical, physical and empirical models. Plan and conduct an investigation individually and collaboratively to produce data to serve as the basis for evidence, and in the design: decide on types, how much, and accuracy of data needed to produce reliable measurements and consider limitations on the precision of the data (e.g., number of trials, cost, risk, time), and refine the design accordingly.	Structure and Function: Feedback mechanisms maintain a living system’s internal conditions within certain limits and mediate behaviors, allowing it to remain alive and functional even as external conditions change within some range. Outside that range (e.g., at a too high or tool low external temperature, with too little food or water available) the organism cannot survive.