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Zorluk: Çok zorUnstated Passage Assumptions

Recent bioarchaeological studies of Terminal Classic Maya burials at Motul de San José have utilized strontium isotope analysis (87Sr/86Sr^{87}\text{Sr}/^{86}\text{Sr}) of dental enamel to reconstruct human mobility patterns during the lowland Maya societal transformation of the ninth century CE. Because strontium isotopes in tooth enamel reflect the geological composition of bedrock consumed via local food and water during childhood tooth formation, significant deviations from baseline local isotopic ratios indicate that an individual spent early development elsewhere. Bioarchaeologists observed that individuals buried with high-status grave goods exhibited non-local strontium signatures at twice the rate of lower-status burials. From this disparity, researchers concluded that elite mobility—specifically diplomatic intermarriage and political exile—served as the primary vector for regional cultural homogenization across geographically isolated polities immediately preceding the political collapse.

However, this argument relies on an alternative explanation that must be evaluated. While the isotopic data undeniably establish non-local geochemical exposure, inferring political or diplomatic migration exclusively from elite material culture overlooks dietary factors. High-status individuals frequently enjoyed privileged access to imported luxury foodstuffs, such as marine fish and highland cacao, harvested from geologically distinct regions. If elite diets regularly incorporated substantial quantities of non-local nutrients during childhood, their dental enamel would register non-local isotopic signatures even if those individuals resided continuously within the local polity.

Which of the following is an unstated assumption required by the author's argument regarding imported foodstuffs?

  1. The strontium present in imported luxury foods is absorbed into human dental enamel in quantities sufficient to measurably alter the overall isotopic ratio away from the local baseline.Cevap
  2. B
    High-status Maya elites were significantly more likely to import luxury foodstuffs than to migrate between regional polities to forge political alliances.
  3. C
    Strontium isotope signatures in human dental enamel are derived primarily from solid food consumption rather than from drinking water.
  4. D
    Bioarchaeologists misidentified the status of individuals buried at Motul de San José by overestimating the prestige of non-local grave goods.
  5. E
    Lower-status individuals at Motul de San José had no access to non-local foodstuffs or regional trade networks.

Cevap

The correct answer is the option stating that strontium from imported luxury foods is absorbed into human dental enamel in quantities sufficient to measurably alter the overall isotopic ratio away from the local baseline.
The author argues that elite consumption of imported foodstuffs during childhood could explain non-local strontium enamel signatures without physical migration. For this argument to hold, it MUST be true that the imported foodstuffs actually contained sufficient strontium from geologically distinct regions to shift the overall ratio in dental enamel. If negating this statement reveals that imported food strontium has negligible impact on enamel composition, the author's proposed alternative explanation becomes impossible, making this statement a required unstated assumption.

Adım Adım Çözüm

1
Identify the author's main claim and conclusion in the passage.
The author claims that non-local strontium signatures in elite burials could be caused by consuming imported luxury foods during childhood rather than by physical migration.
The question explicitly asks for an unstated assumption underpinning this specific counter-argument.
2
Apply the Negation Test to determine the indispensable underlying premise.
If we negate the statement that imported food contains enough strontium to alter enamel ratios (stating instead that imported food cannot absorb or supply sufficient strontium to alter enamel ratios), the author's explanation falls apart entirely.
An assumption is a necessary condition; if its negation destroys the argument, it is the required unstated assumption.
3
Evaluate the remaining choices against common GMAT reading comprehension traps.
Options making comparative claims of likelihood, extreme absolute claims about water vs. food, or misidentifying burial status misinterpret the scope of the logical requirement.
The author only needs the dietary hypothesis to be physiologically possible and capable of explaining the data.

Anahtar Kavram

Unstated Passage Assumptions and the Negation Test in Reading Comprehension
Tahmini Süre:2m 30s
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Unstated Passage Assumptions

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