Each of the following arguments draws a causal or explanatory conclusion from empirical observations. Match each argument with the supplementary finding that most strengthens its conclusion.
- Paleoclimatologist: Ice core strata from an Antarctic dome reveal an abrupt surge in atmospheric methane concentrations coinciding with a rapid deglacial warming episode 14,700 years ago. Because isotopic examination of this trapped gas reveals a depleted carbon-14 profile characteristic of biogenic decomposition in tropical wetlands rather than marine methane hydrates, wetland methane release must have been the primary catalyst that initiated the warming episode.High-resolution stratigraphic dating confirms that the surge in carbon-14 depleted methane preceded the earliest detectable rise in global ocean temperatures by several decades.
- Behavioral Economist: In a municipal workplace study, workers automatically enrolled in emergency savings accounts accumulated three times more savings over twelve months than workers who were required to actively opt in, even though both groups completed the same mandatory financial literacy curriculum. Because both cohorts scored identically on post-curriculum comprehension assessments, the higher accumulation among automatically enrolled workers must be attributable entirely to behavioral inertia rather than disparities in financial literacy.Financial auditing established that workers in the opt-in group did not deposit greater sums into non-workplace liquid savings accounts than did workers who were automatically enrolled.
- Plant Biologist: *Arenaria aggregata*, a cushion plant inhabiting exposed subalpine ridgelines, produces leaf cuticles with forty percent greater tensile strength than those of closely related lowland taxa. Because gale-force winds are frequent along these ridgelines whereas herbivorous insect populations are virtually nonexistent at these elevations, this reinforced cuticle must have evolved primarily to prevent mechanical damage from wind rather than to resist herbivory.Lowland relatives of *Arenaria aggregata* cultivated under simulated high-velocity wind conditions experience severe epidermal tearing and reduced reproductive viability unless their leaf cuticles are artificially reinforced.
Answer
The paleoclimatologist's argument matches with the chronological finding placing the methane surge before the warming; the behavioral economist's argument matches with the finding confirming opt-in workers did not save more in external accounts; and the plant biologist's argument matches with the experimental evidence showing unreinforced plants suffer reproductive failure under high winds.
Each matched pair correctly resolves the distinct inferential vulnerability of the stimulus. For the paleoclimatological claim, demonstrating that the methane surge preceded warming by decades validates the causal direction and rules out reverse causality. For the economic study, auditing external accounts eliminates the primary alternative explanation that opt-in workers saved outside the workplace program. For the botanical claim, demonstrating that wind stress inflicts structural damage and fitness loss on unreinforced plants directly substantiates the claim that the trait evolved as an adaptation to mechanical wind forces.
Step-by-Step Solution
Key Concept
Strengthening causal and explanatory arguments through chronological validation, elimination of competing explanations, and demonstration of selective mechanisms
Estimated Time:2m 0s