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71 questions

All types71Multiple choice36Multiple select17True / False18
Question 61Question →

Forestry Researcher: Over the past decade, managers of the Eldridge Timber Reserve introduced the predatory European pine beetle (*Rhizophagus grandis*) to suppress populations of the destructive great spruce bark beetle (*Dendroctonus micans*). Surveys indicate that spruce tree mortality in the reserve plummeted by 45 percent over this period. Because no chemical pesticides or other management interventions were deployed, the introduction of the predatory beetle was clearly the primary factor responsible for the dramatic recovery of the spruce forest.

Which of the following, if true, most seriously weakens the forestry researcher's argument?

Show answer & explanation

Answer: Throughout the same decade, unmanaged spruce forests in adjacent regions with no predatory beetle introductions experienced an identical decline in spruce tree mortality following a succession of unusually cold winters.

Answer

The finding that unmanaged spruce forests in adjacent regions without predatory beetle introductions experienced an identical mortality decline following unusually cold winters most seriously weakens the argument by demonstrating that the recovery occurred independently of the predator introduction.
The correct answer provides a natural control group by demonstrating that spruce forests in neighboring regions with no introduced predators experienced the identical forty-five percent decline in mortality due to severe cold winters. This provides a strong, comprehensive alternative explanation that accounts for the observed effect across the region, severely undermining the claim that the introduction of the predatory beetle was the primary cause of the recovery.

Step-by-Step Solution

1
Isolate the conclusion and supporting premises in the stimulus.
The researcher concludes that the introduction of the predatory beetle caused the 45 percent drop in spruce mortality, inferring this solely from the timeline and the absence of chemical pesticide interventions.
Accurately identifying the central causal claim is the necessary first step in evaluating a weaken item.
2
Identify the critical logical assumption and vulnerability in the causal inference.
The author assumes that no regional climatic or ecological factor independently caused the decrease in spruce bark beetles and tree mortality over the same decade.
Causal conclusions based on simple before-and-after correlation are vulnerable to confounding external variables.
3
Evaluate the answer choices for evidence of an alternative cause or a control group where the effect occurs without the cause.
The information that adjacent unmanaged spruce forests without predatory beetles experienced the exact same 45 percent drop due to cold winters shows the effect happens without the proposed cause, establishing a compelling alternative explanation.
Demonstrating that the effect occurs equally in the absence of the hypothesized cause effectively breaks the causal connection.

Key Concept

Undermining a causal conclusion by introducing a control group and an alternative explanatory variable
Estimated Time:1m 30s
Question 62Question →

Aviation Inspector: Commercial airlines that implemented automated optical scanning systems for wing rivet inspections reported a forty percent decrease in undetected structural stress fractures compared to airlines relying solely on manual tactile inspections. Because these automated optical systems detect surface hairline irregularities far more rapidly than human technicians, mandating automated optical scanning industry-wide will substantially reduce the occurrence of catastrophic in-flight structural failures.

Which of the following, if true, most seriously weakens the aviation inspector's argument?

Show answer & explanation

Answer: Technicians at airlines utilizing automated optical scanning frequently omit secondary ultrasonic testing, which detects the subsurface metal fatigue responsible for almost all catastrophic failures.

Answer

The argument is most seriously weakened by evidence that technicians using automated optical scanning frequently omit secondary ultrasonic testing that detects the subsurface metal fatigue responsible for nearly all catastrophic failures.
The correct response demonstrates that the adoption of automated optical scanning induces a procedural lapse: technicians bypass ultrasonic scans. Because subsurface metal fatigue—detectable only through ultrasonic testing—causes nearly all catastrophic failures, mandating optical scanning could paradoxically fail to prevent, or even exacerbate, catastrophic failures.

Step-by-Step Solution

1
Isolate the conclusion and supporting premises of the stimulus.
Premises establish that automated optical scanning detects surface hairline irregularities faster and correlates with fewer undetected stress fractures. The conclusion claims that mandating optical scanning industry-wide will substantially reduce catastrophic in-flight structural failures.
Clarifying the boundary between premise evidence and the author's broader claim exposes the logical leap.
2
Identify the core assumption bridging surface rivet scanning to catastrophic failure prevention.
The author assumes that catching surface stress fractures via optical scanning addresses the actual primary cause of catastrophic in-flight structural failures without creating offsetting diagnostic blind spots.
Weaken questions require identifying unstated assumptions linking the evidence to the outcome.
3
Evaluate the choices for new information that severs this link or reveals a counterproductive consequence.
The statement showing that adopting optical scanners leads maintenance crews to skip ultrasonic checks for subsurface fissures (which actually cause catastrophic failures) directly undermines the conclusion.
Introducing a negative behavioral side-effect that targets the true mechanism of catastrophic failure invalidates the claim that the mandate will improve safety.

Key Concept

Weaken via Flawed Causal Link and Unintended Diagnostic Trade-offs
Estimated Time:1m 20s
Question 63Question →

Materials Scientist: Conservators restoring a historic limestone facade observed accelerated surface spalling on sections treated with an ethyl silicate consolidant compared to untreated sections. Because ethyl silicate reacts with ambient moisture to deposit silica without chemically degrading the stone's calcite matrix, the consolidant itself cannot be responsible for the deterioration. Therefore, the accelerated spalling must be caused entirely by localized environmental factors, such as wind-driven salt spray.

Statement: The finding that ethyl silicate deposits an impermeable silica layer that traps evaporating groundwater beneath the stone surface during freeze-thaw cycles, if true, weakens the materials scientist's argument.

Show answer & explanation

Answer: True

Answer

True. The additional evidence directly weakens the materials scientist's conclusion by establishing that the consolidant can induce mechanical failure even if it remains chemically non-reactive.
The conclusion of the argument attributes the accelerated deterioration solely to localized environmental factors, reasoning that because the consolidant is chemically inert with respect to calcite, it cannot cause damage. The supplementary statement shows that the consolidant introduces a serious physical vulnerability (trapping moisture beneath an impermeable barrier during freeze-thaw cycles). Because this demonstrates that the consolidant is indeed responsible for the increased spalling via physical rather than chemical means, the statement successfully weakens the scientist's argument.

Step-by-Step Solution

1
Analyze the core argument structure in the stimulus
Premise 1: Spalling was accelerated on treated sections. Premise 2: Ethyl silicate does not chemically degrade the calcite matrix. Intermediate Conclusion: The consolidant cannot be causing the damage. Main Conclusion: Localized environmental factors must be the sole cause of the accelerated spalling.
Identifying the explicit premises and the inferential leap between lack of chemical degradation and complete lack of causal responsibility is necessary to evaluate the argument.
2
Identify the key gap and assumption in the author's reasoning
The author assumes that chemical degradation is the only mechanism by which the consolidant could cause the limestone facade to deteriorate.
Weaken questions frequently target false dichotomies or overlooked alternative mechanisms.
3
Evaluate the impact of the statement on the conclusion
Trapping internal moisture and inducing freeze-thaw spalling establishes a physical mechanism of degradation caused directly by applying the consolidant, refuting the claim that the consolidant is harmless.
Providing a valid causal link between the consolidant and the observed spalling directly undermines the author's conclusion that environmental factors alone are responsible.

Key Concept

Alternative Causal Mechanisms and False Exclusions
Estimated Time:1m 15s
Question 64Question →

Energy Analyst: A regional manufacturing plant recently replaced its conventional incandescent warehouse lighting with high-efficiency smart LED arrays equipped with automated motion sensors. Following the installation, the facility's total monthly electricity consumption dropped by 18 percent. Therefore, if other manufacturing plants in the region adopt the same smart lighting arrays, they can likewise expect their total facility electricity consumption to decrease by roughly similar margins.

Which of the following, if true, most seriously weakens the energy analyst's argument?

Show answer & explanation

Answer: Unlike typical regional manufacturing plants where continuous machinery dominates power use, the trial facility was a low-occupancy depot where lighting accounted for nearly all electricity consumption.

Answer

The argument is most weakened by pointing out that the trial facility was a low-occupancy depot where lighting made up almost all electricity use, unlike typical plants where heavy machinery accounts for most power consumption.
The author concludes that because one facility achieved an 18 percent reduction in total electricity consumption via lighting upgrades, other manufacturing facilities will achieve similar percentage savings. The choice showing that the test facility was an unautomated depot where lighting constituted virtually all energy consumption reveals that the sample is unrepresentative. In typical plants where heavy machinery accounts for the bulk of power usage, eliminating even a substantial amount of lighting energy will translate to only a negligible percentage drop in overall electricity consumption.

Step-by-Step Solution

1
Identify the premises and conclusion of the argument.
Premise: Replacing warehouse lighting with smart LEDs in one plant led to an 18 percent drop in total monthly electricity consumption. Conclusion: Other regional manufacturing plants adopting these arrays will experience roughly similar reductions in total electricity consumption.
Determining the core inference is essential to evaluate the unstated assumptions linking the sample to the broader population.
2
Identify the primary logical vulnerability in the author's reasoning.
The author assumes that the single test facility's energy distribution profile is representative of other regional manufacturing plants.
An 18 percent drop in total power consumption from lighting alone is only possible if lighting represents a very large proportion of the plant's overall energy load.
3
Evaluate the answer choices for new information that breaks this representative sample assumption.
The choice showing that the trial facility had disproportionately high lighting energy use compared to typical plants where heavy machinery dominates directly undermines the conclusion.
If lighting accounts for only a minor fraction of a typical plant's total energy consumption, lighting upgrades cannot produce an 18 percent decrease in total facility electricity use.

Key Concept

Unrepresentative Sample in Generalization Arguments
Estimated Time:1m 15s
Question 65Question →

Economic Development Director: To combat a multi-year decline in consumer foot traffic in the historic Riverside shopping district, the city implemented a "Tax-Free Tuesday" initiative six months ago, eliminating local sales tax on all retail purchases made on Tuesdays. Since the initiative began, total retail revenue in the Riverside district during the traditional Monday-through-Friday workweek has surged by 18 percent compared to the prior six months. This surge clearly demonstrates that the tax-free initiative has successfully attracted a substantial number of new shoppers to the district.

Which of the following, if true, most seriously weaken the director's argument? Select all that apply.

Select all that apply

Show answer & explanation

Answer: Consumers who previously did all their shopping in the Riverside district on weekends have overwhelmingly shifted their shopping trips to Tuesdays to benefit from the tax exemption.; Six months ago, the Riverside district's merchants association mandated a district-wide 20 percent price increase on all retail goods to fund historical preservation efforts.

Answer

The correct options are the one indicating that existing weekend shoppers shifted their visits to Tuesdays, and the one stating that a district-wide 20 percent price increase was implemented.
The argument rests on the assumption that an increase in weekday retail revenue must be the direct result of a substantial number of *new* shoppers arriving in the district. The correct choices attack this assumption by providing alternative explanations for the revenue increase. The option regarding weekend shoppers shifting to Tuesdays explains the weekday revenue surge without any new shoppers being added to the district's overall traffic. The option regarding the 20 percent price increase demonstrates that the 18 percent revenue increase could easily occur even if the actual number of shoppers remained flat or declined, since total revenue is a product of both price and volume.

Step-by-Step Solution

1
Analyze the argument's structure to identify the premises and the main conclusion.
Premise: Tax-Free Tuesday was implemented 6 months ago. Premise: Weekday retail revenue has since surged by 18 percent. Conclusion: The initiative successfully attracted new shoppers to the district.
Deconstructing the argument into its core components is necessary to locate the logical gap.
2
Identify the logical leaps or underlying assumptions made between the evidence and the conclusion.
The author assumes two things: first, that a surge in 'weekday revenue' equates to an overall increase in district traffic (ignoring the weekend), and second, that an increase in 'revenue' equates to an increase in the 'number of shoppers'.
Identifying unstated assumptions reveals the vulnerabilities in the argument that can be exploited to weaken it.
3
Evaluate each option to determine if it exposes a vulnerability by providing an alternative explanation for the premises.
One correct option exploits the 'weekday vs. weekend' gap by showing existing shoppers merely changed their schedule. The other correct option exploits the 'revenue vs. volume' gap by showing that higher prices, not more shoppers, drove the revenue increase.
In a multi-select weaken question, you must identify all choices that independently sever the link between the premises and the conclusion.

Key Concept

Identifying alternative explanations for causal claims and distinguishing between related but distinct metrics (e.g., revenue vs. foot traffic, weekday vs. overall week).
Question 66Question →

Paleoclimatologist: Stalagmites from the Kavir Cave system exhibit a sharp twenty percent decrease in oxygen-18 isotope ratios approximately 4,200 years ago, a geochemical pattern commonly associated with intensified monsoonal rainfall. Because archaeological surveys show that agrarian settlements in the adjacent valley were abruptly deserted during this precise fifty-year window, catastrophic regional flooding from torrential rains must have driven the inhabitants to abandon their communities.

Statement: The argument's conclusion is significantly undermined if the oxygen-18 ratio in regional cave dripwaters is primarily determined by atmospheric moisture source trajectories rather than the volume of local precipitation.

Show answer & explanation

Answer: True

Answer

True, because demonstrating that the isotopic shift reflects wind and moisture trajectories rather than rainfall volume removes the evidentiary basis for the claim that catastrophic flooding caused the valley's abandonment.
The author builds a causal argument attributing settlement abandonment to severe flooding, based solely on a drop in oxygen-18 isotopes that is 'commonly associated' with heavy rain. The statement identifies an alternative driver for the isotopic anomaly (shifting moisture source trajectories). If true, this alternate explanation decouples the isotope data from rainfall volume, removing the sole support for the flooding hypothesis and significantly weakening the conclusion.

Step-by-Step Solution

1
Isolate the conclusion and the supporting premises in the stimulus.
The conclusion is that catastrophic flooding from torrential monsoonal rains forced inhabitants to abandon their valley settlements. The premises are that cave stalagmites show an oxygen-18 ratio drop (often linked to higher rainfall) and that valley settlements were deserted during the same period.
Identifying the structural core of the argument reveals the logical gap between the proxy evidence and the causal claim.
2
Identify the unstated assumption linking the geochemical proxy to the conclusion.
The author assumes that the observed oxygen-18 decrease was specifically caused by high rainfall volume rather than an alternative atmospheric or environmental mechanism.
Weaken questions frequently target unstated assumptions where alternative causes could account for the observed phenomenon.
3
Evaluate the impact of the statement on the author's reasoning.
If moisture source trajectories primarily govern the isotopic ratios, the stalagmite data no longer serves as evidence of torrential precipitation, undermining the causal claim of flood-induced abandonment.
Providing a viable alternative explanation for the data severs the link between the premise and the conclusion, making the statement logically true.

Key Concept

Undermining causal inferences based on proxy data by providing alternative causal mechanisms
Estimated Time:1m 30s
Question 67Question →

Marine Biologist: Over the past decade, populations of native ribbon kelp in the North Sound estuary declined by sixty percent. During the same period, water salinity in the estuary dropped significantly due to increased agricultural runoff from nearby farms. Because laboratory experiments confirm that juvenile ribbon kelp tissue suffers cellular degradation when exposed to reduced salinity, the decline in North Sound's ribbon kelp must be primarily caused by this agricultural runoff.

Which of the following statements, if true, undermine the marine biologist's argument? (Select all that apply.)

Select all that apply

Show answer & explanation

Answer: An invasive species of herbivorous sea urchin that feeds voraciously on mature ribbon kelp was introduced to the North Sound estuary ten years ago and has since multiplied substantially.; The agricultural runoff entering the estuary contains dissolved nutrients that neutralize cellular stress in juvenile ribbon kelp, keeping juvenile survival rates in North Sound consistent with historical averages.

Answer

The argument is undermined by the statements identifying an alternative cause (the proliferation of an invasive kelp predator) and showing that local runoff conditions prevent the juvenile mortality observed in laboratory settings.
The argument concludes that agricultural runoff caused the kelp decline based on a concurrent drop in salinity and laboratory tests on juvenile kelp. The statement regarding the invasive sea urchin undermines the conclusion by introducing a plausible alternative cause that occurred over the same timeframe. The statement regarding dissolved nutrients neutralizing cellular stress in the wild weakens the argument by showing that the laboratory findings do not apply to the actual conditions in the estuary.

Step-by-Step Solution

1
Identify the conclusion and supporting premises in the stimulus.
Conclusion: The decline in North Sound's ribbon kelp was primarily caused by agricultural runoff. Premises: Salinity dropped due to runoff over the past decade, and laboratory tests show juvenile kelp tissue degrades in low salinity.
Isolating the core causal claim is essential for evaluating potential counterevidence.
2
Identify the logical assumptions connecting the premises to the conclusion.
The author assumes no other major confounding factor caused the decline, and that laboratory observations directly translate to wild estuary conditions.
Weakeners target unstated assumptions or provide alternative explanations for observed phenomena.
3
Evaluate each option against the causal chain.
The option introducing an invasive grazing sea urchin provides an alternate cause, while the option showing nutrient buffering in the estuary breaks the link between laboratory data and wild outcomes.
Both findings directly reduce the likelihood that agricultural runoff was the primary driver of the population decline.

Key Concept

Weakening causal arguments by introducing alternative explanations or invalidating the application of experimental data to wild conditions
Question 68Question →

Agricultural Scientist: In an effort to reduce synthetic pesticide applications, orchard managers introduced a predatory mite species into twenty commercial apple orchards to suppress herbivorous red spider mite populations. Over the subsequent three seasons, red spider mite damage to apple crops in these orchards fell by forty-five percent. Because synthetic pesticide applications remained constant across all twenty orchards throughout this period, the introduction of the predatory mites was clearly the primary cause of the reduction in crop damage.

Statement: If regional meteorological records confirm that unusually heavy rainfall during those three seasons fostered the widespread proliferation of a native fungal pathogen lethal to red spider mites, the agricultural scientist's conclusion is significantly weakened.

Show answer & explanation

Answer: True

Answer

True
The conclusion asserts a specific causal relationship: predatory mites caused the reduction in red spider mite damage. Providing evidence that a fungal pathogen flourished during the exact same period and attacked the pest population introduces an alternative cause, which directly weakens the author's causal claim.

Step-by-Step Solution

1
Identify the argument's premises and main conclusion
Premise: Predatory mites were introduced; red spider mite damage dropped by 45%; chemical pesticide use remained unchanged. Conclusion: The introduction of predatory mites was the primary cause of the reduction in damage.
Isolating the core causal claim is essential for evaluating any potential weakener.
2
Identify the central assumption underlying the causal inference
The author assumes that no other unmeasured confounding factor or environmental variable caused the reduction in red spider mite populations during the three-year period.
Causal conclusions on the LSAT assume the absence of alternative explanations for the observed correlation or change.
3
Evaluate the impact of the statement on the causal claim
The proliferation of a lethal fungal pathogen during the trial provides a viable competing explanation for the pest decline, weakening the claim that predatory mites were responsible.
Demonstrating an alternate cause directly undermines the validity of the scientist's primary conclusion.

Key Concept

Identifying Alternative Explanations in Causal Arguments
Estimated Time:1m 15s
Question 69Question →

Paleoclimatologist: Sediment core analysis from an ancient crater lake revealed a sharp spike in iron isotope concentrations dating to 4,000 years ago, coinciding with an abrupt regional decline in deciduous tree pollen. Because sustained arid conditions dry out surface soils and markedly increase the atmospheric deposition of iron-rich mineral dust, researchers concluded that a prolonged megadrought caused the regional vegetation collapse.

Statement: If it is established that a series of volcanic eruptions in an adjacent region deposited iron-rich ash over the lake during that exact era, this finding would weaken the paleoclimatologists' argument.

Show answer & explanation

Answer: True

Answer

True. The supplementary discovery introduces an alternative explanation for the sediment data, thereby weakening the conclusion.
The statement is true. The author infers that a megadrought occurred based entirely on the presence of iron-rich sediment. Showing that volcanic eruptions during the exact same timeframe could account for the iron deposits introduces a viable alternative explanation, thereby significantly weakening the inference that drought conditions existed and caused the ecological shift.

Step-by-Step Solution

1
Identify the argument's premises and main conclusion.
Premises: An iron isotope spike coincided with pollen decline; droughts increase airborne iron-rich dust. Conclusion: A prolonged megadrought caused the vegetation collapse.
Deconstructing the argument isolates the evidentiary basis from the author's causal claim.
2
Identify the unstated assumption connecting the evidence to the conclusion.
The author assumes that drought-blown dust is the only plausible or primary source of the iron isotope spike in the lake sediment.
Weaken questions on causal arguments target unstated assumptions regarding alternative explanations.
3
Evaluate the logical effect of the new information in the statement.
Discovering that volcanic ash deposited iron at the exact same time provides an alternative cause for the physical evidence, severing the link between the sediment record and the megadrought hypothesis.
Providing an alternative explanation for the observed correlation undermines the support for the proposed conclusion.

Key Concept

Weakening causal arguments by introducing an alternative explanation for the observed evidence
Question 70Question →

Urban Planner: To reduce traffic congestion, the city fully subsidized public transit passes for all car-owning residents of the central business district. Six months later, average morning rush-hour commute times for vehicles entering the central business district have decreased by twenty percent. This clearly demonstrates that the transit subsidy successfully motivated a large number of these residents to switch from driving to taking public transit.

Which one of the following, if true, most seriously weakens the urban planner's argument?

Show answer & explanation

Answer: The vast majority of employed car-owning residents of the central business district commute to workplaces located entirely outside the district.

Answer

The statement regarding residents commuting to workplaces located entirely outside the district most seriously weakens the argument.
The correct answer severs the causal relationship by highlighting a directional scope shift. The premise cites a decrease in vehicles entering the district during the morning. However, if the subsidized residents work outside the district, their morning commute would be exiting the district. Therefore, a change in their driving habits could not possibly explain the decrease in entering traffic, destroying the author's conclusion that the subsidy caused the observed improvement.

Step-by-Step Solution

1
Identify the conclusion of the argument.
The transit subsidy motivated a large number of central business district (CBD) residents to switch from driving to taking public transit.
This is the author's primary claim, indicated by the phrase 'This clearly demonstrates that...'
2
Identify the premise supporting the conclusion.
Average morning rush-hour commute times for vehicles entering the CBD have decreased by 20%.
The author uses this single data point as the sole evidence for the conclusion.
3
Analyze the logical gap (assumption) between the premise and the conclusion.
The argument assumes that a reduction in driving by CBD residents would cause a decrease in traffic entering the CBD during the morning.
For the conclusion to be valid based on the premise, the group receiving the subsidy (residents) must be the same group responsible for the specific traffic metric that improved (morning inbound traffic).
4
Evaluate the options to find the one that attacks this assumption.
The option stating that residents commute to workplaces outside the district attacks the assumption.
If residents work outside the CBD, their morning commute is outbound. If they stop driving, it reduces outbound traffic, not inbound traffic. Therefore, the subsidy cannot be the cause of the decreased inbound commute times.

Key Concept

Identifying Causation vs. Correlation and Scope Shifts (Directionality)
Question 71Question →

Economist: To combat inflation without stifling economic growth, the central bank should implement a targeted reserve requirement increase solely for commercial banks with assets exceeding $50 billion. By restricting the lending capacity of only the largest institutions, the policy will curb the excessive money supply driving inflation while allowing smaller regional banks to continue providing the credit necessary for localized business expansion.

Statement: The economist's argument is effectively weakened by the fact that regional banks typically rely on syndicated loans—which are organized and primarily funded by the largest commercial banks—to finance localized business expansion.

Show answer & explanation

Answer: True

Answer

True
The statement correctly weakens the argument because it exposes a critical flaw in the economist's plan. The economist relies on the premise that smaller banks will compensate for the restricted lending of larger banks. The statement invalidates this premise by demonstrating that smaller banks cannot provide this credit without the financial backing of the larger banks.

Step-by-Step Solution

1
Deconstruct the argument to identify the main conclusion and the premises supporting it.
Conclusion: Increasing reserve requirements only for large banks will combat inflation without stifling economic growth. Premises: The policy restricts large banks (curbing inflation) while permitting smaller regional banks to continue providing credit for business expansion (sustaining growth).
Understanding the precise relationship between the premises and the conclusion is necessary to identify vulnerabilities in the reasoning.
2
Identify the unstated assumption linking the premises to the conclusion.
The author assumes that the lending capacity of smaller regional banks is functionally independent of the lending capacity of the largest commercial banks.
For the plan to work as intended, restricting the large banks must not indirectly restrict the small banks' ability to provide credit.
3
Evaluate the impact of the provided statement on the argument's assumption.
The statement reveals that regional banks rely heavily on funding from large commercial banks (via syndicated loans) to finance localized business expansion. Therefore, if large banks are restricted, regional banks lose their funding source.
This directly attacks the unstated assumption by establishing a critical dependency, demonstrating that the plan will likely fail to achieve its goal of sustaining economic growth.

Key Concept

Identifying and attacking unstated assumptions regarding the causal or structural independence of variables within an argument.
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