Information and Ideas

Many linguists hypothesize that the vocabulary a language uses for spatial relations influences how its speakers mentally represent space. For instance, speakers of languages that rely on absolute directions (like 'north' or 'east') are thought to maintain a constant awareness of their geographic orientation, unlike speakers of languages that rely on relative directions (like 'left' or 'right'). To test this, researcher Kenji Sato and colleagues placed participants from two distinct linguistic groups in a windowless, rotating room. Sato hypothesized that after the room was rotated, speakers of the absolute-direction language would still be able to accurately point toward specific geographic landmarks, whereas speakers of the relative-direction language would not.

Which finding, if true, would most directly support Sato's hypothesis?

Evolutionary biologist Dr. Sonia Alvarez investigated how urbanization affects the diet of the green anole lizard (*Anolis carolinensis*). Alvarez hypothesized that because urban environments are warmer than nearby forests due to the urban heat island effect, urban green anoles experience elevated metabolic rates. To maintain their energy balance under these conditions, Alvarez proposed that urban lizards selectively forage for prey items with higher lipid densities, such as beetles and spiders, rather than lower-lipid prey like flies and ants.

Which finding, if true, would most directly support Alvarez's hypothesis?

During the Byzantine Empire, mosaicists crafted stunning wall decorations using tesserae—small, hand-cut pieces of glass, stone, or ceramic. To maximize the reflective quality of these mosaics, artisans did not press the tesserae flat into the damp plaster. Instead, they set the pieces at slight, irregular angles. This uneven mounting allowed the individual tesserae to catch and reflect candlelight and daylight from various viewpoints, creating a shimmering, dynamic effect that shifted as viewers walked through the cathedral. Gold tesserae, in particular, were created by sandwiching a thin layer of gold leaf between two layers of clear glass, protecting the precious metal from tarnishing.

According to the text, which statement is true about the gold tesserae used in Byzantine mosaics?

Urban heat islands, characterized by elevated temperatures in city centers compared to rural surroundings, have been shown to accelerate the phenology of many plant species, causing them to leaf out earlier in the spring. However, researcher Elena Vance and colleagues observed that urban populations of the cherry plum (*Prunus cerasifera*) did not leaf out earlier than rural populations, despite experiencing warmer spring temperatures. Vance hypothesized that this anomaly occurs because *P. cerasifera* requires a minimum threshold of winter chilling to break bud dormancy. Because milder urban winters delay the completion of this chilling requirement, which choice most logically completes the text?

In the peat swamp forests of Borneo, the pitcher plant *Nepenthes hemsleyana* has evolved a mutualistic relationship with Hardwicke's woolly bat (*Kerivoula hardwickii*). While most pitcher plants typically attract and digest insects, *N. hemsleyana* features a specialized parabolic reflector on its inner wall that reflects the bats' high-frequency echolocation calls, helping the bats locate the plants in dense vegetation. The bats use the pitchers as roosting sites, where they are protected from predators. In return, the bats deposit nitrogen-rich guano inside the pitchers. This fecal matter is crucial for the plant's survival, supplying approximately $34\%$ of its total nitrogen budget.

Based on the text, what is true of the relationship between Hardwicke's woolly bats and *Nepenthes hemsleyana* pitcher plants?

Eelgrass plays a critical role in coastal ecosystems by stabilizing sediment and providing habitats for marine life. However, agricultural nutrient runoff often triggers microalgal blooms that block sunlight, causing eelgrass declines. Ecologist Sarah Alvarez monitored several estuaries to study this dynamic. She observed that in estuaries with high nutrient levels but low populations of filter-feeding bivalves, eelgrass density decreased significantly. Conversely, in estuaries with similarly high nutrient levels but abundant populations of filter-feeding bivalves, eelgrass beds remained healthy and dense. Which choice most logically completes the text?

Sociable weavers (*Philetairus socius*) construct massive compound community nests that can house hundreds of birds. A study analyzed the internal temperature of these structures and found that the central chambers of the nest maintain a remarkably stable temperature, remaining warmer than the surrounding air during cold desert nights and cooler during the peak heat of the day. This thermal buffering is achieved through the nests' large bulk and thick straw walls, which insulate the inner chambers. However, the outer chambers fluctuate in temperature similarly to the exterior environment, offering little thermal regulation. Thus, only the nesting pairs occupying the interior rooms benefit from this energy-saving microclimate.

Based on the text, what is true of the temperature in different areas of a sociable weaver nest?

In arid regions of western India, ancient stepwells, known as *baoris*, served as multi-story subterranean water-harvesting systems. Beyond their primary function of collecting monsoon rainwater, these structures were designed to provide relief from the intense summer heat. Architecturally, stepwells descend deep into the earth, which shields the lowest pool of water from direct sunlight and wind. Because of this subterranean design, evaporation is significantly reduced compared to open reservoirs, allowing the pooled water to remain relatively cool throughout the dry season. Additionally, the masonry galleries built along the descending steps create shaded, ventilated zones where travelers and local communities could gather to escape the heat.

Based on the text, what is one reason why the water in a *baori* remains cooler than that in an open reservoir?

The bacterium *Deinococcus radiodurans* is renowned for its ability to survive extreme doses of ionizing radiation that would be lethal to most other organisms. While radiation shatters the bacterium’s chromosome into hundreds of fragments, *D. radiodurans* can assemble these pieces back into a functional genome within hours. Researchers have determined that this rapid repair is facilitated by the bacterium's ring-like nucleoid structure, which keeps the damaged DNA fragments in close spatial alignment. This structural arrangement prevents the fragments from diffusing away from one another, allowing repair proteins to efficiently rejoin the correct segments in their original order.

According to the text, how does the structure of *Deinococcus radiodurans* support its genome repair process?

Climatologist Dr. Elena Rostova and her team investigated how geothermal heat flux under the West Antarctic Ice Sheet influences glacial sliding velocity. Rostova hypothesized that local geothermal hot spots liquefy the basal ice layer, creating a thin film of water that lubricates the interface between the ice and bedrock, thereby accelerating glacier flow toward the ocean independently of atmospheric temperature shifts.

Which finding, if true, would most directly support Rostova's hypothesis?

To understand how regional dialects persist despite high geographic mobility, sociolinguist Elena Rostova analyzed lexical variation across two demographically similar towns: Oakhaven, which has a single major local employer, and Pineview, where the workforce commutes daily to a metropolitan center. Rostova hypothesized that towns with lower external labor integration maintain stronger local linguistic markers due to denser local social networks. Her survey revealed that Oakhaven residents used traditional regional terms at a rate nearly three times higher than Pineview residents did, and that Oakhaven residents reported significantly more social interactions confined entirely within town borders. _______

Which choice most logically completes the text?

Archaeologist Dr. Angela Rossi and her team investigated the spatial distribution of Upper Paleolithic cave paintings in southern France. They hypothesized that prehistoric artists did not select painting sites at random, but rather chose locations within caves that possessed unique acoustic resonance properties, specifically where low-frequency vocalizations produced long, echoing reverberations. To test this hypothesis, Rossi's team measured the reverberation times of low-frequency sounds at various points throughout several caves and compared these measurements to the density of rock art found at each site. Which finding from the team's study, if true, would most directly support their hypothesis?

The bombardier beetle (*Brachinus crepitans*) possesses a unique defensive mechanism to deter predators. Within its abdomen are two separate chambers containing different chemical compounds: hydroquinones and hydrogen peroxide in one, and a mixture of catalytic enzymes in the other. When threatened, the beetle contracts muscles that force the contents of the first chamber into the second. The resulting rapid chemical reaction produces a boiling, noxious liquid that the beetle can spray from the tip of its abdomen. This spray reaches temperatures of nearly 100 degrees Celsius and can be aimed in almost any direction, successfully repelling attackers.

Based on the text, which statement is true of the chemicals stored in the bombardier beetle's abdomen?

Botanist Dr. Chloe Danvers investigated the relationship between mycorrhizal fungi and the drought tolerance of tomato plants ($\textit{Solanum lycopersicum}$). Danvers hypothesized that although mycorrhizal fungi generally enhance water absorption by expanding a plant’s root surface area, high soil phosphorus levels suppress this symbiotic relationship, thereby rendering the fungi less effective at helping the plants survive dry periods. Which choice, if true, would most directly support Danvers’s hypothesis?

Paleoclimatologists often estimate ancient atmospheric carbon dioxide ($CO_2$) levels by analyzing the stomatal index (the ratio of gas-exchange pores to total epidermal cells) of fossilized leaves, as many modern plants decrease their stomatal density under higher $CO_2$ concentrations. In studying fossilized leaves of the conifer *Ginkgo adiantoides* from the Late Cretaceous epoch, researcher Dr. Helen Vance noted a significant decrease in stomatal index during a period of warming. However, Vance also observed that modern *Ginkgo* trees show no change in stomatal index when grown under elevated temperatures alone, maintaining a stable ratio unless the ambient $CO_2$ level itself is altered. Which choice most logically completes the text?

Prior to the Uniform Penny Post reform of 1840 in the United Kingdom, the cost of sending a letter was determined by the distance the letter traveled and the number of sheets of paper it contained, with the recipient, rather than the sender, usually paying the postage. This system often deterred people from sending or accepting correspondence due to high and unpredictable rates. The 1840 reform revolutionized the postal service by introducing a flat rate of one penny for pre-paid letters weighing up to half an ounce, regardless of the distance traveled. Consequently, this change shifted the financial responsibility to the sender and dramatically increased the volume of mail sent across the country.

Based on the text, what was true of the postal system in the United Kingdom before the reform of 1840?

Although Norse seafarers of the early medieval period lacked magnetic compasses, they navigated the open waters of the North Atlantic using calcite crystals known as Iceland spar. By holding these double-refracting crystals up to the sky, navigators could identify the position of the sun even under dense cloud cover or during twilight. A team of researchers led by Stephen Harrigan simulated these voyages under varying atmospheric conditions. The team found that while Iceland spar was highly reliable under overcast skies, its efficacy decreased significantly in heavy fog because the water droplets dispersed the polarized light, preventing the crystal from producing the distinct double-refraction pattern required for alignment. Consequently, during periods of thick fog, Norse navigators relied on alternative sensory cues, such as the behavior of seabirds and ocean swells, to estimate their position.

Based on the text, what is true of the use of Iceland spar by Norse navigators?

In cognitive psychology, researchers investigated how auditory distractions affect visual-spatial processing. Participants performed a spatial navigation task while exposed to either steady low-frequency hums or irregular, high-frequency clicks. The researchers found that while low-frequency hums did not decrease performance, the irregular high-frequency clicks significantly reduced spatial accuracy. However, when participants performed the same spatial task while concurrently completing a verbal memory task, the addition of the high-frequency clicks caused no further decline in spatial accuracy beyond the reduction caused by the verbal task itself. This suggests that ______

Which choice most logically completes the text?

Economist Dr. Hannah Vance and her team investigated the economic impact of "micro-transit" systems—flexible, on-demand public shuttle services—in suburban cities. Vance hypothesized that these networks, by connecting low-income residential areas directly to commercial centers, would boost the revenues of local micro-businesses (firms with fewer than five employees) within those centers. Vance's team analyzed commercial activity in several commercial centers before and after the introduction of micro-transit services. Which finding from the study, if true, would most directly support the team's hypothesis?

Many orchid species rely on visual and olfactory mimicry to attract specific insect pollinators. The orchid *Ophrys speculum* mimics the female wasp *Campsomeris ciliata* to attract male wasps. Although this mimicry is highly effective, researchers noted that in regions where female wasps are exceptionally abundant, the pollination rate of *Ophrys speculum* drops significantly, even though the male wasp population remains constant. Because male wasps prioritize actual females when available, the presence of real females reduces the appeal of the decoy orchids. Therefore, in areas with high densities of female *Campsomeris ciliata*, the orchids are likely to experience ______

Which choice most logically completes the text?