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K-2 Bio Shell9-12 · K-2 Bio Shell: Evidence and mechanism investigation

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Structured investigationBiology

K-2 Bio Shell: Evidence and mechanism investigation

K-2 Bio Shell focus: observable living-system structure and function. One changed variable must be separated from the controls.

Which measurements and controls support the strongest Grade 9 explanation of observable living-system structure and function?

CourseBiology

RigorOn-level

Performance artifactEvidence-based laboratory report

Evidence minimum2 evidence forms

Connect a controlled measurement and its uncertainty to a qualified causal model.

system
mechanism
variable
evidence

1Frame model
2Predict
3Investigate
4Analyze uncertainty
5Revise
6Defend
7Transfer

Model

Variables, controls, and causal model

Run 3 controlled trials. Record the changed variable, controls, measured response, and uncertainty before choosing a mechanism.

Keep fixed: starting system state and observation interval
Measure: System response
Uncertainty: Use repeated trials and report the observed range before comparing models.
Model limit: The K-2 Bio Shell model supports claims only within the tested variables and boundary conditions.

System condition54%Environmental pressure32%

Select the causal model that can be distinguished through a controlled comparison.

Evidence

Dataset and uncertainty

Commit a falsifiable model and run the repeated trials to generate the dataset.

Evidence-based laboratory report

reproducible method
analyzed dataset
uncertainty statement
qualified causal model

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