Arguments and Evidence

For decades, paleoanthropologists debated whether Neanderthals were hyper-carnivorous apex predators or opportunistic omnivores whose diets included a significant amount of plant matter. Recent scientific advancements have provided clearer insights, allowing researchers to distinguish between speculative claims about Neanderthal foraging habits and empirical evidence. Studies analyzing the stable isotope ratios of nitrogen-15 in Neanderthal bone collagen consistently reveal high values, which directly mirror those of modern terrestrial carnivores like wolves. This chemical signature indicates that Neanderthals obtained the vast majority of their dietary protein from large herbivores. However, researchers analyzing microfossils trapped in fossilized dental calculus (plaque) from Neanderthal teeth have recovered starch grains and phytoliths from wild barley and tubers. Some of these plant microfossils exhibit structural alterations, such as gelatinized starch walls, that occur only when starch is cooked. While the isotope data establishes that meat was the primary protein source, the dental microfossils demonstrate that Neanderthals routinely harvested, prepared, and consumed cooked plants, refuting the claim of strict hyper-carnivory.

Based on the passage, which of the following correctly matches each claim regarding Neanderthal diets with the specific empirical evidence that supports or refutes it?

Passage

For years, agricultural historians debated the primary driver behind the rapid population growth in medieval Europe between the tenth and thirteenth centuries. Traditional accounts attributed this demographic surge entirely to the adoption of the three-field crop rotation system. Proponents of this view argued that dividing arable land into three parts—with one planted in autumn, one in spring, and one left fallow—increased crop yields by $30\%$ compared to the older two-field system. However, recent archaeological and paleoclimatic data suggest that this agricultural shift was a secondary effect rather than the primary cause. Climate records show that Europe experienced a prolonged warming period, known as the Medieval Warm Period, which extended growing seasons and allowed cultivation at higher altitudes. Furthermore, soil samples from across northern Europe reveal that early three-field systems were often implemented inconsistently, with many regions maintaining traditional methods well into the twelfth century. Thus, while the three-field system undoubtedly improved food security in specific locales, it was the regional rise in temperature that initiated the broader agricultural surplus, creating the conditions necessary for the system's eventual widespread adoption.

Based on the passage, which of the following statements represents a piece of evidence used by the author to support the claim that early three-field crop rotation was not adopted uniformly?

Passage

For centuries, materials scientists have marveled at the durability of ancient Roman concrete, which has survived for two millennia in harsh marine environments where modern concrete degrades in decades. A key breakthrough came when researchers analyzed the mineralogical composition of mortar samples from the ancient harbor of Caesarea. They discovered the presence of a rare mineral, aluminous tobermorite, which crystallizes within the concrete. The researchers hypothesized that this crystallization process is actively triggered by the percolation of seawater through the concrete's pores. Rather than damaging the structure, the mineral growth reinforces it over time, filling microscopic cracks and increasing the concrete's overall tensile strength. To support this claim, scientists conducted laboratory simulations exposing Roman-style volcanic ash mortar to saline solutions. Over several months, they observed a significant increase in the concentration of tobermorite crystals alongside a measurable decrease in mortar permeability. This finding suggests that the ancient builders intentionally designed a material that relies on environmental interactions to achieve long-term structural integrity.

Question

Based on the passage, match each of the researchers' claims about ancient Roman concrete with the specific evidence or findings used to support it.

For decades, archaeologists debated the primary function of the massive 'Great Houses' of Chaco Canyon, built by the Ancestral Puebloans between 900 and 1150 CE. Early theories posited that these structures, which contain hundreds of rooms, served as densely populated urban centers or residential hubs. However, recent architectural and taphonomic analyses have cast doubt on this domestic hypothesis. Critics point out that Chacoan Great Houses show surprisingly little evidence of daily habitation; excavation sites reveal a notable dearth of domestic hearths, cooking vessels, and organic refuse heaps compared to contemporary residential villages nearby. Furthermore, the rooms within the Great Houses are exceptionally large and organized in formal, highly planned layouts with restricted access points, suggesting administrative or ritual usage rather than flexible family quarters. Instead, many researchers now argue that the Great Houses functioned primarily as ceremonial centers and regional storehouses, designed to host periodic gatherings and manage agricultural surpluses. Under this view, Chaco Canyon was a pilgrimage site, occupied intensively only during ritual cycles.

According to the passage, the claim that the Great Houses did not serve as densely populated residential hubs is supported by which of the following pieces of evidence?

Read the following passage and match each theoretical claim regarding the self-domestication model of dogs with the specific textual excerpt from the passage that serves as its direct supporting evidence.

Passage

For decades, evolutionary biologists have debated the mechanisms underlying the transition from wild wolves to domestic dogs (Canis lupus familiaris). The traditional 'active taming' hypothesis suggests that Upper Paleolithic hunters actively captured wolf pups, hand-reared them, and selectively bred those with desirable traits. However, recent fossil evidence from archaeological sites in Siberia and Europe has challenged this view, prompting the development of the 'self-domestication' or 'commensal scavenger' model. Proponents of this theory argue that wolves initiated contact by scavenging around human hunter-gatherer camps. Wolves with shorter flight distances (less fear of humans) were more successful at accessing human food refuse. Over generations, these bolder wolves reproductively isolated themselves from wild populations, leading to anatomical and behavioral changes. While critics point out that early human waste heaps were likely insufficient to sustain a wolf subpopulation, defenders of the self-domestication model cite isotopic analyses of Paleolithic canine bones. These analyses reveal a distinct diet rich in human-provided food scraps rather than the large game typically hunted by wild wolves. Thus, rather than active human intervention, dog domestication may have begun as an evolutionary response to a new ecological niche created by human settlements.

Passage

For decades, archaeologists studying pre-Columbian Andean civilizations focused on the contrasted agricultural strategies of the Tiwanaku state and the Wari Empire. While the Tiwanaku, situated in the high-altitude Lake Titicaca basin, relied heavily on *waru waru*—raised fields surrounded by canals that buffered crops against nighttime frosts—the Wari, operating in steeper terrain, pioneered extensive stone-walled terracing systems. Some scholars have argued that the Wari’s reliance on terracing was not merely an ecological adaptation to steep slopes, but a deliberate tool of imperial expansion and centralized political control. Proponents of this view point out that Wari terraces required highly standardized engineering techniques and massive communal labor inputs, both of which were organized directly by state administrators residing in regional administrative hubs like Pikillacta. Furthermore, excavation data from these terraced sites consistently reveals a monoculture of maize, a prestige crop used to brew chicha for state-sponsored feasts, rather than the diverse subsistence crops grown on traditional, non-terraced family plots. By controlling the production of this politically significant crop, the Wari elite secured the loyalty of local populations, using the agricultural infrastructure to bind peripheral regions to the imperial center.

According to the passage, which of the following details from Wari terraced sites best supports the claim that the terracing system was a tool of centralized political control rather than simply an ecological adaptation?

Read the following passage and match each of the researcher's theoretical claims regarding the mycorrhizal network (listed on the left) with the specific textual evidence that supports it (listed on the right).

Passage
For years, popular science writers have championed the 'Wood Wide Web' hypothesis, which posits that mycorrhizal fungi networks facilitate a cooperative, altruistic exchange of nutrients between mature trees and struggling seedlings. However, plant ecologist Dr. Elena Vance argues that these underground networks are sites of resource competition rather than community aid. According to Vance, mature trees use the fungal connections to actively suppress the growth of understory competitors by absorbing disproportionate amounts of soil phosphorus, effectively starving nearby seedlings. Vance's team monitored phosphorus-32 isotopes in a mixed temperate forest and found that oak seedlings connected to mature oak networks exhibited a 40% reduction in phosphorus uptake compared to isolated seedlings. Furthermore, Vance points out that the carbon transferred from mature trees to seedlings via these networks is negligible—accounting for less than 1% of the seedlings' daily carbon requirements. Critics of Vance's model suggest that the reduced phosphorus levels are merely a byproduct of soil saturation, but Vance counter-argues that the isotopic tracing showed direct transport paths leading away from seedling root zones toward mature trees. Ultimately, Vance contends that mycorrhizal networks are best understood as biological conduits exploited by dominant species to maintain canopy supremacy.

For decades, paleontologists have debated the primary driver behind the sudden extinction of North America's Pleistocene megafauna, such as mammoths and saber-toothed cats, around 13,000 years ago. The 'overkill hypothesis' posits that newly arrived human hunters, possessing advanced Clovis projectile points, hunted these large mammals to extinction within a few centuries. Proponents of this model point to the chronological coincidence between the arrival of humans and the disappearance of the megafauna.

However, critics argue that the archaeological record does not sufficiently support this scenario. Opponents emphasize that of the dozens of megafaunal species that went extinct, only a tiny fraction—namely mammoths and mastodons—have been found in direct association with Clovis hunting tools at archaeological sites. Furthermore, they note that several large species, such as bison, survived the period despite being hunted by humans. Critics suggest that rapid climate fluctuations at the end of the Pleistocene epoch, which dramatically altered habitats and food webs, were the actual primary driver of the extinctions, rather than human overhunting.

According to the passage, critics point to the low number of extinct megafaunal species found alongside Clovis tools in order to support which of the following claims?

Passage

Biologists observing Australian bushfires have long noted that raptors, such as the black kite (*Milvus migrans*) and brown falcon (*Falco berigora*), congregate at fire fronts to capture escaping prey. However, a study by Bonta et al. proposes a far more active role: these birds act as 'pyrophiles' that intentionally propagate fire by carrying burning twigs in their talons to unburned areas. Skeptics argue that this behavior is accidental, suggesting that birds merely drop embers while retrieving prey. To evaluate these competing interpretations, researchers analyzed three key behavioral patterns: first, multiple birds systematically carrying embers to the same unburned patch; second, the selection of smoldering hardwood twigs over lighter, fast-burning grass; and third, the directional movement of birds against prevailing winds to start new fire lines, maximizing prey exposure. These observations suggest a deliberate ecological strategy rather than sporadic, accidental occurrences. By starting new fires, the raptors force prey out of previously safe havens, suggesting that the behavior is a coordinated hunting tactic.

Question

Based on the passage, match each of the researchers' claims about raptor behavior on the left with the specific evidence that supports it on the right.

Passage

For years, cognitive scientists widely accepted the 'bilingual advantage' hypothesis, which posits that managing two languages enhances executive function, such as working memory and cognitive flexibility. This claim was supported by early, small-scale studies showing bilinguals outperforming monolinguals on tasks like the Simon sorting game. However, researcher Dr. Elena Vance recently conducted a meta-analysis of over one hundred studies on bilingual cognition. Vance’s analysis revealed a striking pattern: while small studies with fewer than fifty participants frequently reported a significant bilingual advantage, larger studies with sample sizes exceeding three hundred consistently showed no statistically significant difference in executive function between the two groups. Vance argues that this discrepancy is evidence of publication bias, where studies showing positive results are disproportionately published, while those showing null results are shelved. To support this, she demonstrated that the average effect size decreased systematically as the sample size of the studies increased. Vance contends that once this bias is statistically corrected, the cognitive advantage of bilingualism effectively vanishes.

According to the passage, which of the following findings does Dr. Vance present as direct support for her claim that publication bias has distorted the research on the 'bilingual advantage'?

Passage

For billions of years, Mars has transitioned from a warm, wet world with a thick atmosphere to the cold, dry desert we see today. In 2014, NASA’s MAVEN (Mars Atmosphere and Volatile EvolutioN) spacecraft entered orbit to investigate the mechanisms driving this transition. Specifically, researchers hypothesized that the solar wind—a stream of charged particles constantly emitted by the Sun—was responsible for stripping away the Martian atmosphere.

MAVEN's instruments measured the rate of atmospheric ion loss under different solar conditions. During solar storms, such as coronal mass ejections, the rate of ion escape into space increased by a factor of more than ten. Furthermore, MAVEN detected a magnetic 'tail' stretching behind Mars, where solar magnetic field lines drape around the planet and accelerate ions outward. These observations demonstrate that solar activity actively drives the depletion of Mars’s light gases. While some scientists previously argued that internal planetary cooling and the subsequent loss of Mars's global magnetic field were the primary drivers of atmospheric escape, MAVEN's real-time data shows that external solar wind interactions remain the dominant force in the ongoing stripping of the Martian atmosphere.

Question
Match each of the scientific claims on the left with the specific textual evidence on the right that provides direct supporting evidence.

Passage

In the 1920s, the advent of commercial acoustic recording technology transformed southern American vernacular music, yet the physical constraints of early phonographs fundamentally altered how musicians performed. Because early recording diaphragms were insensitive to low frequencies, bass instruments like the upright bass were often replaced by brass tubas or omitted entirely, forcing guitarists to develop percussive thumb-slapping techniques to maintain rhythmic drive. Furthermore, early wax discs allowed a maximum recording window of roughly three minutes per side. Consequently, musicians who were accustomed to extended, improvisational live performances were compelled to condense their song structures into rigid, verse-chorus arrangements with heightened tempo consistency. Ethnomusicologist Dr. Arlo Vance argues that these technological limitations did not merely document blues traditions, but actively reshaped them, creating a standardized musical syntax that subsequent generations of artists mistook for ancient folklore rather than studio-driven adaptation.

Based on the passage, match each of the researcher's analytical claims on the left with the specific textual evidence from the passage on the right that directly supports it.

Passage
For decades, urban centers of the ancient Indus Valley, such as Harappa and Mohenjo-daro, were characterized as strictly regimented societies dependent entirely on centralized, large-scale granaries for food distribution. However, recent micro-botanical analyses of starch grains and phytoliths retrieved from domestic hearths challenge this monolithic narrative. Archaeobotanist Dr. Elena Rostova identified diverse residues of millets, pulses, and local wild flora within modest residential structures. These findings suggest that urban households engaged in decentralized, opportunistic cultivation and gathering alongside state-administered grain supplies. Furthermore, isotopic analysis of cattle teeth found near residential quarters revealed localized grazing patterns rather than long-distance transhumance. Together, these lines of evidence indicate that Indus urban food systems were far more resilient and flexible than previously thought, relying on a hybrid economy of centralized infrastructure and localized, household-level subsistence strategies.

Which of the following details from the passage provides the most direct evidence supporting the claim that Indus urban food systems relied in part on localized, household-level subsistence strategies?

Passage:
In the field of historical economics, scholars long asserted that the 18th-century Industrial Revolution in Britain was driven primarily by domestic technological innovations in steam power and textile production. Economic historian Dr. Aris Thorne, however, argues that global maritime trade networks and cheap colonial raw materials were the true indispensable catalysts. Critics of Thorne's perspective point out that Britain possessed abundant, low-cost domestic coal reserves, suggesting that internal resource availability—not external trade—was the primary driver of industrial mechanization. Thorne responds to this objection by demonstrating that domestic coal could only be extracted and transported cost-effectively after foreign-sourced timber secured mine shafts and colonial capital funded early transport infrastructure.

Based on the passage, which of the following best describes the function of the critics' argument regarding domestic coal reserves?

Passage:
For decades, conservation biologists asserted that the primary driver of declining kelp forest ecosystems along the Pacific coast was elevated sea surface temperatures resulting from climate shifts. However, recent ecological studies have highlighted the profound impact of sea otter population dynamics on these marine environments. Proponents of the trophic cascade theory argue that sea otters, as keystone predators, regulate sea urchin populations, thereby preventing overgrazing of giant kelp. Skeptics of this ecological model point out that in certain northern coastal bays where otter populations remained robust, kelp beds still experienced severe seasonal die-offs, suggesting that thermal stress remains the decisive factor. Nevertheless, proponents clarify that these localized die-offs occurred exclusively during extreme marine heatwaves that temporarily inhibited kelp nutrient absorption regardless of urchin density. By addressing this apparent anomaly, researchers demonstrated that top-down predator control and bottom-up climatic factors interact rather than act as mutually exclusive forces.

Based on the passage, the author refers to the observation regarding kelp die-offs in bays with robust otter populations primarily in order to:

Passage:
For decades, biological oceanographers assumed that deep-sea benthic communities relied exclusively on organic detritus drifting down from sunlit surface waters—a phenomenon known as "marine snow." However, the 1977 discovery of thriving ecosystems around hydrothermal vents challenged this paradigm by revealing chemosynthesis, wherein microbes convert chemical energy from vent fluids into organic matter independent of sunlight. While some marine paleontologists initially posited that these vent ecosystems functioned in complete isolation from surface dynamics, recent geochemical analyses of vent fauna shells have revealed trace isotopes of surface-derived carbon. This evidence indicates that while chemosynthesis underpins local primary production, deep-sea vent communities still interweave surface-derived nutrients into their trophic webs. Thus, recognizing hydrothermal vents as partially integrated into global carbon cycles rather than wholly isolated refuges provides a more accurate model of oceanic energy flow.

In the context of the passage as a whole, the statement that some marine paleontologists posited vent ecosystems functioned in complete isolation serves primarily to:

Passage:
For decades, paleoanthropologists maintained that the invention of controlled fire was the single catalyst that allowed early hominins to expand into colder, high-latitude Eurasian environments during the Early Pleistocene. Proponents of this "thermal adaptation" hypothesis pointed to burnt bones and ash deposits found at hearth sites in temperate zones as proof that survival without artificial heat was physiologically impossible. However, recent micro-stratigraphic analyses of early European cave sites reveal that hominin occupation layers during glacial periods frequently lack any trace of combustion residue or charcoal. Instead, stone tool cut marks on fossilized ungulate remains indicate that these early populations relied heavily on high-calorie animal fats and dense mammalian hide clothing to maintain thermal homeostasis. Far from being an indispensable prerequisite for northern migration, controlled fire appears to have been adopted opportunistically long after hominins had already established permanent settlements in frigid climates.

Based on the passage, the author references the "burnt bones and ash deposits" primarily in order to:

Passage:
In urban planning literature, high-albedo reflective roofs have frequently been promoted as the single most effective municipal intervention for mitigating the urban heat island effect. Proponents highlight how increasing surface albedo significantly reduces thermal absorption at the roof level. However, microclimate researchers point out that while reflective roofs lower surface temperatures on rooftops, they reflect solar radiation downward into surrounding pedestrian corridors, potentially intensifying heat stress for individuals at ground level during peak afternoon hours. To resolve this trade-off, recent architectural frameworks advocate for a integrated approach combining reflective roofing with vertical green walls to absorb reflected light.

Based on the passage, what function does the reference to the downward reflection of solar radiation into pedestrian corridors serve in the overall argument?

Read the passage below and evaluate the statement that follows.

In early twentieth-century organology, the study of musical instruments, scholars asserted that the structural evolution of bowed stringed instruments in early modern Europe was driven almost exclusively by deliberate acoustic refinement aimed at maximizing sound projection in large public halls. Proponents of this view frequently pointed to the consistent thickness profiles and specific arching patterns observed in classic Italian violins as evidence of early master luthiers possessing an advanced theoretical understanding of vibrational mechanics.

However, recent historical analysis of sixteenth-century artisan guild records and regional trade ledgers presents a contrasting narrative. These documents indicate that timber selection—specifically the preference for high-altitude alpine spruce—was heavily dictated by strict municipal logging quotas, seasonal transport logistics, and guild-enforced material standards rather than theoretical acoustic modeling. Furthermore, workshop manuals from the period emphasize standardized geometric templates derived from traditional woodworking apprenticeships rather than acoustic experimentation. Consequently, contemporary historians argue that attributing past instrument design innovations primarily to sophisticated acoustic engineering overestimates the empirical intentions of historical artisans.

Statement: The author's argument relies on the unstated assumption that municipal logging quotas and guild material standards were not themselves originally established to optimize the acoustic performance of the instruments.

Read the four short argument excerpts regarding historic preservation policies below. Match each argument excerpt on the left with the core unstated assumption on which its conclusion fundamentally relies on the right.