South Dakota Science MS-LS2-4
The Standard
Construct an evidence-based argument that articulates how changes to physical or biological components of an ecosystem affect populations. (SEP: 7; DCI: LS2.C; CCC: Stability/Change)
South Dakota Science Standards (2024) · Ecosystems: Interactions, Energy, and Dynamics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students use observations or data to explain how a change in water, temperature, food, or predators affects a population. They connect the change to survival or reproduction and support their explanation with evidence.
What Mastery Looks Like
- Given a before-and-after data table, a student identifies which population grew or shrank and cites the counts. They explain a likely cause without claiming the data prove more than they show.
Common Misconceptions
- Students may confuse a population with the number of different species in an area. They may assume a change affects every organism in the same way or that population numbers change immediately.
How to Assess It
- Exit ticket: A pond shrinks during a dry month, and a fish count drops from 30 to 12. Explain how less water could affect the fish population, and use both counts as evidence.
Lesson moves
Ways to Teach It
Give pairs 12 deer counters and eight food counters, then remove four food counters and compare how many deer can eat.
Ask students to write: If a hawk population grows, what might happen to mice, and what evidence would support your claim?
Deal cards labeled drought, new predator, and extra rainfall; have teams match each change to a population graph and defend one match.
Sketch the schoolyard's grass and pavement, then predict which spot could support more earthworms, using available soil as evidence.
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Printable MS-LS2-4 Worksheet
A ready-to-print activity worksheet aligned to MS-LS2-4, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- K-ESS2-2
Engage in argument from evidence for how plants and animals (including humans) can change the environment to meet their needs.
- 3-LS4-4
Make an evidence-based claim about the validity of a solution to a change in the environment that affects the types of plants and animals that live there.
- MS-LS1-4
Construct an evidence-based argument to support an explanation for a) how characteristic animal behaviors affect the probability of successful reproduction of a...
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