Assumptions

Maritime Regulator: The proposed automated docking protocol relies entirely on continuous satellite telemetry rather than traditional visual guidance from harbormasters. Therefore, mandating this new protocol for all commercial vessels entering the bay will definitively decrease the frequency of docking collisions and subsequently reduce the port's overall operational liabilities.

Which of the following statements function as required assumptions to logically bridge the gaps in the regulator's argument? Select all that apply.

An anthropologist studied several isolated farming communities in the Andean highlands. The study revealed that communities primarily cultivating a specific heirloom variety of quinoa have significantly lower rates of cardiovascular disease than neighboring communities that cultivate standard commercial crops. Based on this observation, the anthropologist concluded that consuming this heirloom variety of quinoa provides unique protective benefits for cardiovascular health.

Which of the following are necessary assumptions required by the anthropologist's argument? (Select all that apply.)

Sociologist: A successful democracy requires an informed electorate. However, a populace can be considered truly informed only if a significant majority consumes media from a diverse array of ideological perspectives. Recent studies reveal that, driven by algorithmic curation, over 80 percent of voters in our nation consume news exclusively from sources that mirror their pre-existing political biases. Therefore, our nation's democratic institutions are inevitably headed for collapse.

Which one of the following is an assumption required by the sociologist's argument?

Public Health Official: A newly constructed water treatment facility in the county uses a chemical agent called Florazine to eliminate bacterial contaminants. Florazine has been proven in laboratory settings to neutralize beneficial aquatic microbes alongside harmful bacteria. Because these beneficial microbes are critical for breaking down heavy metals in the water supply, implementing this new treatment process will ultimately lead to a rise in neurological disorders among county residents.

Which of the following statements must be assumed for the public health official's conclusion to be logically drawn? Select all that apply.

Art historian: The newly discovered 16th-century painting *The Solitary Scholar* contains lapis lazuli, a blue pigment that was exorbitantly expensive at the time. Only artists backed by wealthy patrons could afford to use lapis lazuli extensively in their works. Given that historical records confirm the artist, Vincenzo, died in poverty and never secured a wealthy patron, *The Solitary Scholar* must have been a collaborative effort with an artist who could afford such materials.

Which one of the following is an assumption required by the art historian's argument?

Urban Sociologist: To foster a stronger sense of community, the city council is converting several downtown streets into pedestrian-only zones. Currently, residents rarely interact with one another in these areas because heavy vehicle traffic makes the streets excessively noisy and dangerous. By eliminating cars from these specific streets, the city will ensure that residents socialize more frequently, thereby successfully strengthening community bonds.

Which one of the following is an assumption required by the urban sociologist's argument?

Zoologist: In colonies of the red-crested macaque, individuals that regularly share food with non-kin spend significantly less time engaging in social grooming. Social grooming is the primary behavior through which macaques establish and maintain their position in the colony's hierarchy. Therefore, by regularly sharing food with non-kin, these macaques are actively diminishing their social standing.

Which of the following statements function as a valid supporter assumption required to bridge the logical gap in the zoologist's argument? (Select all that apply)

Paleontologist: Fossilized remains of the ancient amphibian *Dendrerpeton* have been found exclusively in geological formations corresponding to harsh, arid desert environments of the late Carboniferous period. Since all modern amphibians require constant access to substantial bodies of freshwater to survive, *Dendrerpeton* must have possessed specialized physiological adaptations for water retention that modern amphibians lack.

Which one of the following is an assumption on which the paleontologist's argument depends?

Zoologist: The recent discovery of fossilized feathers on the forelimbs of the theropod dinosaur *Velociraptor* strongly suggests that this species was capable of sustained endothermy, or warm-bloodedness. Feathers provide excellent thermal insulation, a feature that would be entirely unnecessary for an ectothermic, or cold-blooded, animal living in the uniformly warm climate of the Cretaceous period. Therefore, *Velociraptor* must have generated its own body heat.

Which one of the following is an assumption required by the zoologist's argument?

The city will implement the proposed congestion charge only if the public transit system's capacity is increased by at least 20 percent. Furthermore, the transit system's capacity can be expanded by that amount only if the state legislature approves the pending transit grant. Therefore, unless the state legislature approves the transit grant, the city's downtown air quality will not improve significantly.

The conclusion drawn above depends on which one of the following assumptions?

Historian: The collapse of the Bronze Age civilization of Alashiya was long attributed to a massive earthquake. However, sediment core analyses reveal a multi-decade drought immediately preceding the collapse. Furthermore, contemporaneous administrative tablets show an abrupt shift from recording luxury trade to issuing frantic requests for grain. Therefore, the collapse was fundamentally driven by climatological resource scarcity rather than sudden seismic activity.

Evaluate the following statement as true or false regarding the argument above:
The statement 'The abrupt shift in the administrative tablets to requests for grain was not primarily a response to agricultural devastation wrought by a sudden earthquake' functions as a necessary assumption for the historian's conclusion.

Ecologist: In the region's heavily logged forests, the population of the native spotted owl has plummeted. Conservationists argue that the logging of old-growth trees destroyed the owl's necessary nesting habitat, causing the decline. However, a recent survey shows that the invasive barred owl, which aggressively competes with the spotted owl for prey, recently expanded its range into these exact same logged forests. Therefore, the drastic decline in the spotted owl population is primarily due to competition from the invasive barred owl, rather than the loss of nesting habitat.

Which one of the following is an assumption on which the ecologist's argument depends?

Supply chain analyst: In response to recent component shortages, our manufacturing firm is considering shifting from a 'just-in-time' inventory system to stockpiling critical parts. Management believes this shift will prevent the production halts currently caused by sudden supplier delays. However, adopting this new system will not actually increase our overall production reliability. The massive warehouse space required to stockpile these parts will displace our in-house quality-assurance facilities, forcing us to outsource quality control to third-party labs, which are known for their unpredictable turnaround times.

Which one of the following is an assumption required by the supply chain analyst's argument?

Paleontologist: The fossilized remains of the newly discovered dinosaur G. antiquus reveal unusually large eye sockets compared to its contemporary relatives. Because exceptionally large eyes are typically an evolutionary adaptation for maximizing visual acuity in low-light conditions, G. antiquus must have been a nocturnal species that hunted exclusively during the night.

Which one of the following is an assumption required by the paleontologist's argument?

Match each logical argument with the required bridging (supporter) assumption that logically connects its premise to its conclusion.

Historian: A newly deciphered administrative tablet from the ancient city of Oakhaven lists the daily rations given to the city's palace guards. These rations consisted entirely of barley and dried fish. In contrast, military records from the neighboring city of Riverton from the same period explicitly mention supplementary rations of figs and olives for their guards. Therefore, Oakhaven's palace guards must have had a less varied diet than Riverton's guards.

Which one of the following is an assumption required by the historian's argument?

Coffee Importer: Our cooperative should immediately convert all conventional sun-grown coffee farms to shade-grown coffee. Although shade-grown farming yields $30\%$ fewer beans per hectare, shade-grown specialty beans sell for a $50\%$ premium over conventional beans. Therefore, making this complete conversion will undoubtedly increase the cooperative's overall profits.

Which of the following are necessary assumptions upon which the coffee importer's argument depends? Select all that apply.

Marine biologist: The population of the rare blue-finned reef fish in the Coral Bay sanctuary will likely begin to increase over the next few years. Last year, authorities implemented a strict ban on all fishing in the sanctuary. Since the ban took effect, the number of blue-finned reef fish caught by illegal fishers has plummeted. This critical reduction in human-caused mortality provides the species with the necessary conditions to replenish its numbers.

Which one of the following is an assumption required by the marine biologist's argument?

Linguists analyzing the evolution of indigenous languages in the isolated Solenoid Archipelago observed that languages spoken by coastal fishing communities have an unusually high rate of phonetic simplification (the dropping of complex consonant clusters) compared to the languages of inland agricultural communities. The linguists also noted that when a massive seismic event forced several coastal communities to relocate inland a century ago, their languages quickly ceased undergoing phonetic simplification. The linguists hypothesize that the constant ambient noise of crashing ocean waves inherently degrades the oral transmission of complex phonetic structures, thereby causing these languages to simplify over time.

Which of the following are necessary assumptions upon which the linguists' hypothesis depends? Select all that apply.

A ten-year ecological study of the Silver-tufted Macaque found that troops living in regions with high concentrations of naturally occurring lithium in the water supply exhibit significantly lower rates of aggressive intra-troop conflicts compared to troops living in lithium-poor regions. Based on this observation, the researchers concluded that the consumption of lithium-rich water reduces aggressive behavior among these macaques.

Which one of the following is an assumption on which the researchers' argument depends?