Grade 6 Lesson plan
Elderwood Dam and the Fish Ladder: An Ecosystem Change Argument
A 50-minute grade 6 lesson where students use a fictional dam's fish-count data to calculate percent change and argue how much a fish ladder restored the population.
NGSS · Middle School (6–8)
MS-LS2-4 Argue how ecosystem changes affect populations
Construct an argument supported by empirical evidence that changes to physical or biological components of an ecosystem affect populations.
Clarification statement: Emphasis is on recognizing patterns in data and making warranted inferences about changes in populations, and on evaluating empirical evidence supporting arguments about changes to ecosystems.
Why water teaches this standard well
A change to a water body, a dam that blocks fish passage, pollution that drops dissolved oxygen, or a diversion that lowers flow, is a clean example of a physical change reshaping populations. Students can build arguments from real monitoring data on how these water changes ripple through a stream ecosystem.
Materials tagged with this code are written to the full standard , including its clarification statement , and each carries a written note explaining the alignment. See how we review materials.
12 materials aligned to MS-LS2-4
Lesson plans
Worksheets
Grade 7 Worksheet
Kessler Creek Nutrients: When a Fertilizer Becomes a Pollutant
A grade 7 science worksheet using fictional Kessler Creek data: students compute percent change in nitrogen and phosphorus and trace how excess nutrients lower oxygen.
Grade 8 Worksheet
Kestrel Lake's Oxygen Crash: Reading a Summer Depth Profile
A grade 8 science worksheet where students read a fictional lake's dissolved-oxygen depth profile, find the low-oxygen zone, and trace a nutrient-driven fish kill.
Math problem sets
Grade 8 Math problem set
Thistlebrook Creek: Water Temperature and Oxygen Scatter Plot
A grade 8 science problem set where students scatter-plot creek temperature and dissolved oxygen, fit a trend line, and predict when oxygen drops below the fish limit.
Classroom activities
Grade 8 Classroom activity
Nitrogen as Resource and Pollutant: A Sturgeon Lake Diptych Studio
A grade 8 art activity where partners build a two-panel diptych showing a nutrient as both a crop resource and a pollutant that harms fish, with a short argument caption.
Grade 7 Classroom activity
The Corvin Lake Nutrient Path: A Grade 7 Eutrophication Game
A grade 7 role-play where students move nutrient and oxygen tokens along a lake pathway to model fertilizer runoff, an algae bloom, and an oxygen crash.
Reading passages
Grade 7 Reading passage
What Gantry Dam Changed Downstream: A Grade 7 River Reading
A grade 7 science reading passage on how a dam changes the river below it, from blocked fish migration and lower oxygen to trapped sediment and a steadier flow.
Debate kits
Grade 6 Debate kit
Closing Caldmere Reservoir's Ramps to Slow the Mussels
A grade 6 science debate on whether a fictional town should close its boat ramps to keep zebra mussels out, with two-sided evidence on spread, food webs, and cost.
Grade 6 Debate kit
Beaver Dams on Hollowsett Brook: Remove Them or Leave Them?
A grade 6 science debate on whether a fictional town should pull out three beaver dams, with two-sided evidence on flooding, water temperature, oxygen, and habitat.
Grade 7 Debate kit
Should Caldon County Require Buffer Strips Along Yarnell Creek?
A two-session grade 7 science debate on a proposed rule requiring planted stream buffers on farms, with two-sided evidence on nutrients, fish, land cost, and fairness.
Grade 6 Debate kit
Removing Birch Hollow Dam to Restore Fish Passage: A Grade 6 Debate
A grade 6 debate kit on whether a fictional town should remove an aging dam to restore fish passage, weighed against its park pond and flood protection.
Projects
Grade 7 Project
Waverton Creek Temperature Study: Runoff From the Parking Lot
A five-session grade 7 science project on whether parking lot runoff warms a creek, ending in a report and one affordable fix for a fictional public works office.