Analyze the four logical arguments below. Each argument contains a specific causal gap or unstated vulnerability. Match each argument to the single piece of new evidence that most robustly strengthens its conclusion by resolving that specific gap.
- Tracking data over fifteen years shows the median life expectancy of Alpine marmots rising sharply, mirroring a localized collapse in the golden eagle population. Ecologists assert that the alleviation of direct eagle predation allowed the marmots to achieve longer lifespans.Mortality analyses indicate that fatalities attributed to characteristic aerial ambush trauma have decreased from historical baselines by a margin that perfectly accounts for the recent surge in survivorship.
- Following the implementation of aggressive state subsidies for domestic solar panel manufacturing, the nation's volume of fossil fuel imports plummeted by 30%. Policymakers argue these financial incentives were the primary driver of the reduced reliance on traditional energy.Comprehensive audits confirm that total national energy demand did not contract during the period, nor were there any concurrent expansions in alternative renewable sectors like hydroelectricity.
- Participants navigating complex logical tasks in rooms illuminated by short-wavelength blue light completed them 15% faster than cohorts in red-lit rooms. Researchers conclude the specific spectral frequency of the light intrinsically accelerates neurological processing speed.Subjects exposed to identical environmental variables, but wearing specialized lenses that neutralized all ambient color frequencies, exhibited identical baseline performance metrics across all test rooms.
- Artifact analysis at an excavation reveals that 85% of recovered cutting implements exhibit asymmetrical micro-abrasions exclusively on their leftward-facing edges. Anthropologists hypothesize this ancient population possessed a disproportionately high rate of left-handedness.Experimental replication of the tool-manufacturing process reveals that a user's dominant hand invariably dictates the structural location of the resulting micro-abrasions, irrespective of the cutting technique.
Answer
The correct pairings successfully align each causal gap with the evidence that bridges it: the marmot predation claim with aerial trauma data, the solar policy claim with total energy audits, the light frequency claim with color-neutralization controls, and the anthropology claim with experimental tool replication.
Each correct match directly addresses the critical flaw in its respective argument. The marmot argument is strengthened by directly confirming the mechanism of reduced mortality (aerial ambush). The solar subsidy argument is strengthened by ruling out the most likely alternative causes (lower energy demand or other renewables). The blue light argument is strengthened by a control test that isolates light frequency as the active variable. The tool argument is strengthened by explicitly verifying the mechanical relationship between hand dominance and wear patterns.
Step-by-Step Solution
Key Concept
Strengthening causal arguments by ruling out alternative explanations, utilizing control groups to isolate variables, and confirming underlying mechanical linkages.