Compare competing hypotheses or viewpoints and determine points of agreement/disagreement.
Competing viewpoints often share observations but disagree about mechanism.
Core Idea
Separate the shared observation from the disputed mechanism. When two scientists or models explain the same result differently, they often agree on the pattern in the evidence but disagree about the cause.
Understanding
Students often jump straight to the disagreement and miss the overlap.
- Agreement: a result, pattern, or observation both viewpoints accept.
- Disagreement: the cause, mechanism, or best model for that same result.
- Fast check: Do not let a disagreement about cause hide an agreement about the data.
Step by Step
- Identify the observation both viewpoints are trying to explain.
- Separate shared evidence from competing mechanisms.
- Match the answer choice to agreement or disagreement exactly as asked.
Misconceptions
- Assuming scientists who disagree about cause must also disagree about the observed result.
- Choosing a statement that one scientist supports but the other never addresses.
- Missing qualifier words such as mainly, directly, or most likely that define the disagreement.
Worked Example
Water-lily leaves were observed to be flat at sunrise and curled upward by late afternoon. Scientist 1 proposed that rising air temperature increased evaporation from the leaves, reducing cell turgor and causing the curling. Scientist 2 proposed that increasing light intensity altered photosynthetic activity and caused the curling independently of evaporation. Based on the scientists' statements, the scientists would most likely disagree on whether:
Select an answer to see the explanation