Weaken

Anthropologist: The discovery of ceremonial obsidian blades in the ruins of the agrarian Vaelian civilization, which flourished 3,000 years ago, proves that the Vaelians engaged in long-distance commerce. The only known geological source of this specific type of obsidian is Mount Cinder, located nearly 400 miles away from the Vaelian settlements. Given that the Vaelians were deeply tied to their farmlands and lacked the means for long-distance travel, they must have acquired these blades by trading with nomadic groups.

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

Archaeologist: Excavations at the ancient city of Orazia have revealed a formidable stone perimeter wall enclosing only the city's central precinct, which housed the royal palace and primary religious structures. The extensive residential sectors, home to Orazia's general populace, were situated outside this wall and completely unfortified. Surviving state chronicles portray Orazian monarchs as deeply committed to protecting their citizenry from the frequent incursions of neighboring empires. Yet, the architectural record belies this narrative. The deliberate choice to fortify solely the administrative and religious center strongly implies that the wall's primary function was to insulate the ruling class from domestic uprisings, rather than to serve as a bulwark against foreign military threats.

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

Researcher: The hormone somatotropin stimulates growth in juvenile *Rana clamitans*. In a strictly controlled laboratory study, two groups of these frogs were observed for six months. Both groups were provided with identical diets and environmental conditions, differing only in the water's dissolved calcium concentration. The frogs in the high-calcium water exhibited growth rates 30 percent higher than those in the low-calcium water. Because both groups of frogs synthesized identical amounts of somatotropin over the study period, the dissolved calcium must directly enhance the sensitivity of the frogs' cellular growth receptors to this hormone.

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

Consider the following argument:

Public Health Official: Last year, the city launched a comprehensive campaign to encourage drivers to wear seatbelts. The campaign drastically changed behavior: surveys confirm that the proportion of drivers in the city who regularly wear seatbelts surged from 40 percent last year to 80 percent this year. However, recent traffic reports reveal that the total number of severe injuries resulting from car accidents in the city has actually increased by 15 percent compared to last year. Clearly, wearing a seatbelt does not actually reduce a driver's risk of suffering a severe injury in a car accident.

Statement: The official's argument is actively weakened by the new finding that the total number of car accidents in the city also increased by exactly 15 percent over the past year.

Epidemiologist: To evaluate the long-term safety of the new dietary supplement Novagen, researchers conducted a comprehensive five-year study. They tracked 5,000 individuals who consumed Novagen daily for the entire five-year period and compared them to a control group of 5,000 individuals who never consumed it. The researchers ensured both groups were strictly matched for age, diet, exercise habits, and initial cardiovascular health. The data shows that the individuals who consumed Novagen daily for five years had a 40 percent lower incidence of cardiovascular disease than the control group. This conclusively demonstrates that long-term, daily consumption of Novagen provides significant protection against cardiovascular disease.

Which of the following, if true, most seriously weakens the epidemiologist’s argument?

Below are four excerpts from public policy and economic debates. For each argument on the left, identify the single factual statement on the right that, if true, would pose the most severe logical challenge to the speaker's conclusion.

Analyze the four arguments below. Match each argument (Left) to the specific piece of new evidence (Right) that most severely weakens its conclusion by exposing its underlying logical flaw.

Agronomist: The widespread adoption of the genetically modified "Xertex-wheat" in the arid Zephyr Valley is a triumph of biological engineering. Over the five years since farmers switched entirely to Xertex-wheat—maintaining the exact same total acreage of wheat cultivation and utilizing the identical irrigation infrastructure—the annual volume of irrigation water required to prevent crop failure has decreased by 30%. Because rainfall and temperatures have remained strictly constant over the last decade, this reduction conclusively demonstrates that an individual Xertex-wheat plant intrinsically requires significantly less water to survive than an individual plant of the traditional wheat varieties.

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

Financial Analyst: Five years ago, the national government eliminated subsidies for domestic solar panel manufacturers. Since then, the total revenue of the domestic solar industry has increased by 40 percent. Conversely, the domestic wind turbine manufacturing sector, which retained its government subsidies, saw only a 5 percent increase in total revenue over the same period. Clearly, in the renewable energy sector, government subsidies stifle revenue growth rather than encourage it.

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

Neurobiologist: In a recent experiment, laboratory mice whose daily diets were supplemented with the artificial sweetener Zytrol performed significantly worse on spatial memory tasks than a group of mice whose diets were supplemented with an equal caloric amount of natural sucrose. Therefore, we can conclude that the consumption of Zytrol actively impairs spatial memory function.

Statement: The newly discovered fact that mice fed a standard baseline diet containing neither Zytrol nor sucrose performed identically on the spatial memory tasks to the mice fed Zytrol significantly weakens the neurobiologist's argument.

Organizational Researcher: A recent study analyzed the productivity of software development teams at several major technology firms. The study found that teams utilizing 'OpenSpace'—a novel, unstructured collaborative software environment—shipped on average 20 percent more product updates per quarter than teams using traditional, highly structured project management software. Clearly, adopting OpenSpace inherently increases a team's productivity by fostering spontaneous collaboration.

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

Match each flawed argument with the specific piece of counter-evidence that most effectively undermines its conclusion by exposing its underlying logical vulnerability.

Argument:
University Administrator: Last year, we introduced a mandatory study skills workshop for all first-year students on academic probation. This year, the dropout rate among first-year students on academic probation has decreased by 15%. Therefore, the workshop has been effective in helping struggling students stay in school.

Statement:
If true, the fact that the university significantly lowered the academic requirements needed to avoid expulsion this year actively weakens the administrator's argument.

Medical Researcher: We recently concluded a six-month clinical trial of Cardioxil, a new medication for elevated blood pressure. Over the course of the trial, 75 percent of the participants experienced a significant decrease in their blood pressure. Furthermore, among the participants who experienced this decrease, the only reported side effect was occasional mild dizziness. Therefore, Cardioxil is highly effective at lowering blood pressure and presents no serious health risks to those who use it.

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

Read the following argument carefully:

Historians recently discovered that the sudden collapse of the prosperous Toralian trade network in the 12th century coincided precisely with a massive volcanic eruption. Because the eruption covered the Toralian region's primary agricultural centers in thick ash, researchers conclude that the eruption caused the trade network's collapse by devastating the local food supply.

Evaluate the following statement:

The newly uncovered historical record showing that a neighboring civilization—which was completely spared from the volcanic ash fall—maintained a thriving, uninterrupted trade network throughout the entire 12th century actively weakens the researchers' conclusion.

Transportation Analyst: Last year, the city implemented a variable congestion charge for vehicles entering the central business district (CBD) during peak hours. The stated goal was to reduce the total amount of time commuters spend stuck in traffic citywide. Since the charge was introduced, the average speed of vehicles traveling within the CBD during peak hours has increased by 20 percent, and the number of vehicles entering the CBD has dropped by 30,000 per day. Therefore, the congestion charge has successfully achieved its goal.

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

Agricultural scientist: Over the past year, many farmers in the Oakhaven region transitioned to using a newly developed pest-control spray on their apple orchards. A recent survey shows that orchards using the new spray suffered, on average, a 15 percent higher rate of crop damage from insects compared to orchards that continued using the traditional pesticide. Therefore, the new pest-control spray must be less effective at repelling insects than the traditional pesticide.

Which of the following, if true, most seriously weakens the agricultural scientist's argument?

Marine Biologist: Over the past decade, the population of the silver-finned reef shark in the Salerian Sea has declined by nearly 40 percent. During this same period, commercial fishing operations have steadily increased their use of deep-water drift nets in the region. Since drift nets frequently entangle large marine predators, environmentalists have blamed the fishing industry. However, recent surveys show that the shark population has declined just as sharply in the northern marine sanctuary, where all commercial fishing has been strictly banned for twenty years. Therefore, the increased use of drift nets cannot be the primary cause of the shark's decline.

Which of the following, if true, most seriously weakens the marine biologist's argument?

Read the following argument:

Mayor: To boost local tourism, we should allocate municipal funding to restore the historic Riverton Mill. Our neighboring town, Greendale, restored their historic train station last year, and they saw a 25 percent increase in tourist visits this summer. Therefore, restoring our mill will similarly increase Riverton's tourist visits.

Evaluate the following statement: The mayor's argument is actively weakened by the fact that Riverton's historic mill is structurally compromised and will require significantly more funding to restore than Greendale's train station did.

Archaeologists recently unearthed a set of highly standardized basalt weights in the ruins of Kaelen, an inland settlement dating to roughly 1800 BCE. These weights are virtually identical in mass and geometric shape to the standard merchant weights used during the same era in the distant coastal metropolis of Tylos. Historians have long maintained that the treacherous mountain range separating the two regions prevented any direct contact before 1200 BCE. Nonetheless, based on the discovery of these matched weights, Dr. Aris concludes that Kaelen and Tylos must have established a direct trade network with one another by 1800 BCE.

Which of the following, if true, most seriously weakens Dr. Aris's argument?