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Question

Difficulty: MediumStrengthen

Match each of the following research arguments with the supplementary finding that most effectively strengthens its causal conclusion.

  • Marine biologists observe that coastal inlets with resident sea otter populations maintain substantially denser kelp canopies than inlets without otters. They conclude that sea otter predation on herbivorous sea urchins directly preserves kelp forest density.Inlets with and without otters shared identical water temperatures, substrate compositions, and nutrient levels, and the monitored reintroduction of otters to depleted inlets led to an immediate drop in urchin grazing followed by rapid kelp recovery.
  • Forest managers observe that pine stands subjected to periodic low-intensity prescribed burns experienced significantly less crown fire destruction during a severe drought than unmanaged stands. They conclude that prescribed burning directly reduces the vulnerability of pine canopies to catastrophic fire.Burned and unmanaged stands possessed identical slope gradients and tree ages, and prescribed burns specifically eliminated the dense ladder fuels necessary for ground fires to transition into the upper canopy.
  • Linguists observe that regional dialect terms among commercial merchant sailors rapidly converged into a uniform nautical vocabulary following the publication of standardized naval manuals. They conclude that the naval manuals directly drove vocabulary standardization across the commercial fleet.Merchant shipping guilds made the study of official naval manuals mandatory for all commercial deck officers during that period, while regional dialect divergence remained constant among land-based trades in the same ports.

Answer

The marine biology argument matches the finding regarding identical inlet conditions and monitored otter reintroduction; the forestry management argument matches the finding regarding identical slope/age controls and ladder fuel elimination; the historical linguistics argument matches the finding regarding mandatory naval manual training and stable land-based dialects.
Each correct pairing provides crucial supportive evidence for its respective argument: the sea otter argument is strengthened by controlling for abiotic water conditions and demonstrating causal temporal priority; the forestry argument is strengthened by ruling out topographical bias and confirming the physical fuel pathway; and the linguistics argument is strengthened by proving exposure to the manuals while using land-based trades as a negative control.

Step-by-Step Solution

1
Identify the primary causal claim and potential reasoning gap in each argument on the left.
The otter argument assumes no confounding water differences and a direct trophic cascade; the forestry argument assumes burned stands did not simply have better natural topography; the linguistics argument assumes merchant sailors actually engaged with naval manuals rather than undergoing an independent cultural shift.
Strengthening a causal conclusion requires identifying unstated assumptions, confirming mechanisms, or ruling out alternative explanations.
2
Evaluate the supplementary findings on the right to match each with the specific gap it resolves.
The finding regarding inlet environmental controls and chronological reintroduction specifically resolves the otter argument's gap; the finding detailing ladder fuels and slope controls directly validates the prescribed burning mechanism; the finding specifying mandatory guild training and land-based controls directly connects merchant sailors to naval manuals.
A valid strengthener directly bridges the analytical gap between the observed correlation and the asserted cause.
3
Verify that each match is uniquely supportive and cannot be misapplied.
Each right-hand statement addresses the distinct domain, mechanism, and counter-hypothesis of its corresponding left-hand argument.
Ensures precise, one-to-one logical pairing without ambiguity.

Key Concept

Causal strengthening via ruling out confounding variables, establishing mechanism transmission, and providing appropriate control baselines.
Estimated Time:1m 30s
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Topics

Strengthen

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