NGSS HS-LS2-3

ScienceGrades 9–12Ecosystems: Interactions, Energy, and Dynamics

The Standard

Construct and revise an explanation based on evidence for the cycling of matter and flow of energy in aerobic and anaerobic conditions.

Next Generation Science Standards

Teacher's field guide

What Students Need to Do: Students use data from oxygen-rich and oxygen-poor environments to explain how organisms release usable energy from food. They track matter among organisms and surroundings, then revise their explanations when new evidence appears.
What Mastery Looks Like: Given data from two environments, students identify which mode of respiration is likely and support that choice with evidence. They explain that matter is rearranged and reused, while energy moves through the system and some leaves as heat.
Common Misconceptions: Students often say energy cycles like matter, or that matter disappears when food is used. They may think respiration stops without oxygen or that oxygen is the energy source. Some assume all anaerobic pathways produce the same products.
How to Assess It: Exit ticket: In a sealed culture, oxygen drops to zero, glucose decreases, organic acids increase, and microbes remain active. Revise the claim, "No energy can be released without oxygen," then state where matter and energy go.

Lesson moves

Give groups carbon tokens, food cards, and environment mats to model where matter goes and how energy availability changes with oxygen.
Ask students to explain why microbes remain active in oxygen-poor pond mud, citing evidence about matter changes and energy release.
Run a card sort with oxygen levels, energy yields, and habitat descriptions; teams match each evidence set to aerobic or anaerobic conditions.
Show a wastewater treatment diagram with aerated and oxygen-free tanks; students annotate where each condition supports different microbial energy pathways.

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Learning progression

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