Information and Ideas

Historian Dr. Nina Patel investigated the late adoption of the printing press in the sixteenth-century Ottoman Empire. While some scholars argue that the delay was primarily driven by religious opposition to print technology, Patel contends that the barrier was economic: because the production of hand-copied manuscripts was highly decentralized and supported by a vast guild system, the high initial capital required to establish print shops made printed books financially uncompetitive against cheap, scribe-produced manuscripts.

Which finding, if true, would most directly support Patel's contention?

To reconstruct ancient ocean pH, scientists measure boron isotopes in fossil shells of marine organisms. However, these organisms alter their internal chemistry during shell growth—a phenomenon known as the 'vital effect'���which skews isotope ratios away from seawater equilibrium. Scientists correct for this skew by using calibration curves based on modern specimens of the same species grown in controlled environments. A recent study of the benthic foraminifer *Marginopora vertebralis* revealed that its vital effect is heavily influenced by the photosynthetic activity of its symbiotic algae, which varies with light exposure. Therefore, applying a calibration curve to fossil *M. vertebralis* specimens without accounting for the light levels they experienced is likely to ______

Which choice most logically completes the text?

Historically, parchment was made from animal skins, preserving genetic material from the livestock of the eras in which they were produced. Recently, biocodicologists have begun using high-throughput DNA sequencing on centuries-old manuscripts to extract this genetic data. While traditional historians analyze the text of these documents to understand cultural history, biocodicological analysis of the parchment itself reveals details about historical livestock breeds, agricultural practices, and trade routes. By examining these organic substrates, researchers can map the geographic distribution and evolutionary history of animals, providing a physical record that complements or even challenges written histories.

Which choice best states the main idea of the text?

Many plant species adapt to urban fragmentation, where pockets of soil are surrounded by inhospitable concrete. Ecologist Dr. Sarah Jenkins and her team investigated the common dandelion (*Taraxacum officinale*) across urban and rural zones in Chicago. The team hypothesized that urban dandelion populations have adapted to soil fragmentation by producing seeds with lower wind-dispersal capacity—specifically, shorter pappus hairs relative to seed mass���thereby increasing the probability that seeds will settle in the immediate, hospitable soil of the parent plant rather than drifting onto concrete surfaces.

Which choice, if true, would most directly support the team's hypothesis?

Under elevated carbon dioxide ($CO_2$) levels, plants typically exhibit decreased leaf nitrogen concentrations. Some researchers attribute this decline to carbohydrate dilution, where increased photosynthesis produces excess starches that outpace nitrogen uptake. However, botanist Elena Rostova observed that nitrogen levels still drop under high $CO_2$ even when carbohydrate accumulation is experimentally blocked. Pointing to the fact that nitrogen absorption depends on the transpiration stream—the water movement driven by evaporation—Rostova hypothesized that $CO_2$-induced stomatal closure, which reduces transpiration, is the primary cause of the nitrogen deficit. If Rostova's hypothesis is correct, plants grown under elevated $CO_2$ that are also exposed to wind speeds that artificially enhance transpiration should ______

Which choice most logically completes the text?

For decades, historians of science often characterized the work of Islamic astronomers in the golden age as merely preparatory, serving to preserve Greek texts until the European Renaissance. However, recent scholarship on the complex mathematical models developed at the Maragha Observatory in the thirteenth century, such as the Tusi couple, reveals a different primary motivation. These astronomers were not passive curators; rather, they actively sought to resolve the physical and mathematical inconsistencies in Ptolemy's geocentric model. By designing new geometric devices that could model planetary motion without violating the Aristotelian principle of uniform circular motion, they laid crucial mathematical foundations that Copernicus later adopted, demonstrating that their work was an independent, intellectually creative endeavor that fundamentally reshaped celestial mechanics.

Which choice best states the main idea of the text?

Epigraphists studying slate tablets from the Visigothic Kingdom (fifth to eighth centuries CE) in rural Iberia have identified numerous informal documents, such as tax receipts and agricultural inventories, written in vulgar Latin. Historically, scholars argued that literacy in Visigothic society was confined strictly to the ecclesiastical elite residing in urban administrative centers. However, the slate tablets, which were inscribed by individuals lacking formal scribal training, detail transactions between rural inhabitants. Because these tablets were manufactured and utilized entirely within local agrarian communities, _________.

Which choice most logically completes the text?

For years, ecologists studied urban parks primarily as isolated green patches with minimal ecological value compared to undisturbed rural forests. However, recent research by Dr. Elena Vasquez demonstrates that these urban spaces function as vital stepping-stone habitats, facilitating the movement of migratory bird species through fragmented landscapes. By tracking bird flight paths across major metropolitan areas, Vasquez's team revealed that even small, highly manicured municipal parks significantly reduce the energy expenditure of migrating species by providing crucial foraging sites. Consequently, conservation strategies must expand beyond preserving contiguous wilderness to integrate the ecological management of fragmented urban ecosystems.

Which choice best states the main idea of the text?

Stylometry—the statistical analysis of literary style—has revolutionized authorship attribution by identifying subconscious linguistic patterns, such as the frequency of function words, unique to individual writers. Scholars have successfully used these computational methods to resolve long-standing debates over anonymous political pamphlets and disputed historical texts. However, digital humanities researchers caution that stylometric models struggle when applied to early modern theatrical works. In this era, collaborative playwriting was the industry standard, and playwrights frequently revised, co-wrote, or interspersed their work with that of their peers. Consequently, while stylometry excels at mapping isolated authorial signatures, it often misattributes or oversimplifies texts produced within highly collaborative creative networks.

Which choice best states the main idea of the text?

For decades, archaeologists studying ancient Maya civic centers focused primarily on their visual prominence and spatial alignment with astronomical events. However, recent studies in archaeoacoustics suggest that the architectural layouts of Mayan plazas were also intentionally designed for auditory performance. Researchers measuring sound propagation in plazas like those at Palenque found that the stuccoed limestone walls and step-terrace structures functioned as passive amplifiers, projecting spoken words from elevated central platforms across wide, open areas with minimal distortion. This acoustic engineering enabled political and religious leaders to communicate directly with large assemblies of citizens who stood far from the stage, suggesting that these public spaces were designed as much for auditory participation as they were for visual spectacle.

Which choice best states the main idea of the text?

Ancient Roman marine structures, such as breakwaters and piers, have endured for over $2\text{,000}$ years despite constant exposure to seawater. Modern research reveals that this durability is due to the chemical composition of the concrete used. The Romans mixed volcanic ash, known as pozzolana, with quicklime and seawater. This combination initiated a chemical reaction, yielding a rare silicate mineral called aluminum-tobermorite ($Al\text{-tobermorite}$). When seawater subsequently percolates through the concrete, it reacts with the remaining volcanic components, causing new $Al\text{-tobermorite}$ crystals to form. Rather than eroding the material, this continuous exposure to seawater causes the crystals to grow and interlock within the pores of the concrete, thereby reinforcing the structural integrity of the barrier over time.

Based on the text, what is true of the aluminum-tobermorite crystals in Roman marine concrete?

Botanist Dr. Clara Martinez and colleagues investigated the ecological role of nickel hyperaccumulation in the plant *Alyssum bertolonii*. While many researchers hypothesize that accumulating high levels of toxic metals in leaves primarily serves to deter herbivores, Martinez's team proposed that it also functions as a form of elemental allelopathy. Specifically, they suggested that when nickel-rich leaves shed and decompose, they increase nickel concentrations in the topsoil directly beneath the plant's canopy, thereby suppressing the growth of competing, non-accumulator plant species.

Which choice, if true, would most directly support the team's proposal?

The giant isopod (*Bathynomus giganteus*) is a deep-sea crustacean that inhabits the cold, benthic zones of the Atlantic, Pacific, and Indian Oceans. Because food is scarce in these deep-sea environments, *B. giganteus* has adapted to function as a scavenger, feeding primarily on the carcasses of fallen whales, fish, and squid. When food is abundant, the isopod can gorge itself to the point of compromising its locomotive ability. Conversely, when resources are depleted, *B. giganteus* can survive long periods of starvation. In laboratory settings, researchers observed that captive giant isopods could survive for over five years without consuming any food, relying on their highly efficient, slow metabolic rates to sustain vital bodily functions during extended periods of resource scarcity.

Based on the text, what is true of *Bathynomus giganteus* when resources are scarce in its environment?

The hoatzin (Opisthocomus hoazin), a tropical bird native to the Amazon and Orinoco basins, possesses an unusual digestive system. Unlike most birds, which rely on a muscular gizzard to grind seeds and insects, the hoatzin is a strict folivore, feeding almost exclusively on leaves. To digest this fibrous diet, the bird utilizes foregut fermentation, a process facilitated by a highly enlarged crop and lower esophagus. Specialized symbiotic bacteria in these organs break down cellulose before the food reaches the stomach. While this adaptation allows the hoatzin to extract nutrients from otherwise indigestible foliage, it has a significant trade-off: the heavy, filled crop restricts the development of the bird's breastbone and flight muscles, making the hoatzin a notoriously weak and clumsy flyer.

Based on the text, what is true of the hoatzin's digestive system?

Sociologist Dr. Evelyn Arispe investigated the impact of interactive public art installations on urban pedestrian habits. She hypothesized that interactive art—installations requiring physical touch or motion to activate—does not merely cause temporary delays but actively alters pedestrian route selection, prompting individuals to permanently integrate these locations into their daily walking routes, even when the interactive components are inactive. Which choice, if true, would most directly support Arispe's hypothesis?

Dr. Aris Thorne and colleagues investigated the foraging behavior of the desert harvester ant (*Pogonomyrmex salinus*). Because foraging in arid conditions risks desiccation, it has been hypothesized that *P. salinus* workers rely on external environmental cues—specifically, the humidity level near the colony entrance—to decide when to begin foraging, rather than depending solely on internal physiological signals of hydration. To test this hypothesis, the researchers monitored colony foraging rates while experimentally manipulating both the humidity at the nest entrance and the hydration levels of the ants inside the nest. Which finding from the experiment, if true, would most directly support the researchers' hypothesis?

The single-celled slime mold *Physarum polycephalum* lacks a central nervous system, yet it exhibits complex decision-making behavior. In a study led by biophysicist Toshiyuki Nakagaki, researchers placed the organism in a maze with two food sources—oat flakes—positioned at the entrance and exit. The slime mold initially expanded its body to occupy the entire maze. Over several hours, however, the organism retracted its tubular networks from dead ends and consolidated its cytoplasm into a single, thick tube connecting the two food sources. This pathway represented the shortest possible route through the maze, demonstrating that the cell could compute mathematical optimizations through physical feedback loops.

Based on the text, what did *Physarum polycephalum* do when first introduced to the maze?

In the mid-nineteenth century, British landscape painters began incorporating the expanding railway network into their depictions of the countryside. While some art historians argue that these artists celebrated railways as symbols of technological progress, art historian Marcus Thorne contends that painters like Thomas Creswick used these elements to highlight the disruptive encroachment of industrialization on rural life. Which choice, if true, would most directly support Thorne’s contention?

In behavioral economics, the "endowment effect" describes the tendency of individuals to value an item they own more highly than an identical item they do not own. In a series of experiments, researcher Clara Vance examined whether this bias persists in transactions involving digital goods. Vance found that participants who were given a digital music album valued it significantly higher than those who were merely given the opportunity to purchase it. However, when participants were informed that the digital platform's licensing agreement allowed the provider to revoke access to the album at any time, the difference in valuation between the two groups disappeared. Which choice most logically completes the text?

In paleolimnology, the ratio of titanium to calcium ($Ti/Ca$) in sediment cores is often used as a proxy for terrestrial runoff, as titanium is transported from soil erosion while calcium typically precipitates from lake water during dry periods. However, geochemist Maya Lin noted that in lakes surrounded by limestone bedrock, which is rich in calcium carbonate, intense rainfall dissolves the surrounding limestone. This dissolved calcium then enters the lake and precipitates rapidly. Consequently, in lakes with limestone catchment basins, periods of high rainfall and subsequent runoff will likely

Which choice most logically completes the text?