Claim — Science definition

The statement being asserted — what you think is true — stated precisely enough that evidence could contradict it.

Where it is taught

In use

The episode shows both halves of this unit: how powerful a well-supported claim is, and how much depends on the reasoning that connects it to its evidence.

Models, Claims, Evidence & Reasoning

Questions using claim

Problem 1

Illustrative observation: covered soil loses 5 g over a day; uncovered soil loses 12 g in the same setting. Starting water, container, and temperature are stated comparable. A claim says a cover always prevents all evaporation. Write a better claim, cite numerical evidence, explain a plausible mechanism, and identify a limit.
Answer and explanation

The cover is associated with 7 g less measured water loss in this comparison. Reducing exposed soil can reduce evaporation under comparable conditions, but the covered sample still lost 5 g. The record therefore does not support “all evaporation prevented” or “always.” Repeated matched trials and checks for other loss pathways would strengthen the explanation.

Calculate the measured loss difference: 12−5=7 g.

State reduced loss in the observed setting.

Connect the cover with reduced exposure under the model.

Notice that 5 g was still lost and other settings were not tested.

Response criteria

  • Explain the relevant biological process accurately.
  • Use the supplied evidence and show calculation steps with units where needed.
  • Connect a labeled model or mechanism with the claim.
  • State an assumption, evidence limitation, or useful next observation.

Taught alongside

Elsewhere

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