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Difficulty: HardLogical Continuations

For decades, paleoanthropologists relied primarily on zooarchaeological assemblages—such as animal bones found at habitation sites—to reconstruct the diets of Neanderthals. These accumulations heavily featured the remains of large terrestrial herbivores, leading to the consensus that Neanderthals were apex predators who relied almost exclusively on big game. This view contrasted sharply with the perceived dietary flexibility of early anatomically modern humans, whose broader foraging base was often cited as a key factor in their evolutionary success.

The advent of stable isotope analysis introduced a new empirical dimension to this dietary paradigm. By analyzing the ratios of carbon (13C/12C^{13}C/^{12}C) and nitrogen (15N/14N^{15}N/^{14}N) isotopes preserved in bone collagen, researchers can quantify an individual’s trophic level and discern the relative contributions of marine versus terrestrial protein sources. Initial isotopic studies seemed to corroborate the traditional view, yielding high 15N^{15}N values in Neanderthal remains characteristic of high-level carnivores.

Yet, recent methodological refinements indicate that these early isotopic conclusions may have been overly simplistic. The high 15N^{15}N values observed in Neanderthals can also result from the consumption of specific terrestrial resources, such as putrefying meat or certain types of fungi, or even from physiological stress due to nutritional deprivation. Furthermore, when analyzing Neanderthal remains from coastal sites in Iberia, newer isotopic studies—coupled with microbotanical evidence recovered from dental calculus—reveal a substantial intake of marine resources, small fast-moving prey, and diverse plant matter.

These findings mandate a fundamental reassessment of Neanderthal behavioral ecology. Rather than being rigidly adapted to a narrow carnivorous niche, Neanderthals demonstrated a capacity for dietary plasticity that closely mirrors the adaptable foraging strategies once thought unique to early modern humans. Consequently, if the dietary divergence between the two populations was far less pronounced than historically assumed, the long-standing hypothesis that Neanderthal extinction was driven by an inability to exploit diverse food sources _________________

Which one of the following most logically completes the final sentence of the passage?

  1. A
    must be discarded in favor of the widely accepted theory that direct violent competition with modern humans caused their extinction.
  2. B
    reveals that stable isotope analysis is an inherently flawed methodology that consistently misrepresents the trophic levels of archaic hominins.
  3. loses much of its explanatory power, prompting researchers to seek alternative mechanisms for their eventual demographic decline.Answer
  4. D
    suggests that early isotopic studies were accurate in their measurements but failed to account for modern humans having a much narrower foraging base.
  5. E
    indicates that no archaic hominin population was ever truly reliant on a specialized carnivorous niche for survival.

Answer

The phrase stating that the hypothesis loses much of its explanatory power and prompts a search for alternative mechanisms most logically completes the passage.
The correct answer accurately synthesizes the author's argument. The passage demonstrates that new isotopic and microbotanical evidence contradicts the old belief that Neanderthals were rigidly specialized carnivores. Instead, they had dietary plasticity similar to modern humans. Therefore, the old hypothesis—that Neanderthals went extinct because their diets were inflexible—is undermined. Logically, this means the hypothesis loses its explanatory power, and scientists must look for other causes for Neanderthal extinction.

Step-by-Step Solution

1
Analyze the passage's structure and primary argument.
The author contrasts the old view of Neanderthals as specialized carnivores with new evidence showing significant dietary plasticity, similar to that of early modern humans.
Understanding the shift in scientific consensus is necessary to determine the logical outcome of the author's argument.
2
Evaluate the premise leading into the blank.
The final sentence sets up a conditional statement: 'if the dietary divergence between the two populations was far less pronounced than historically assumed...'
The blank must serve as the logical conclusion to this specific conditional premise.
3
Determine the logical impact on the 'long-standing hypothesis'.
Since the hypothesis claims Neanderthals went extinct because they couldn't exploit diverse food sources, and the new evidence proves they actually could, the hypothesis is no longer a strong explanation.
A hypothesis based on a disproven premise loses its validity.
4
Select the option that reflects this logical conclusion.
The correct option points out that the hypothesis loses its explanatory power, leading researchers to look for other reasons for the demographic decline.
This directly resolves the passage's argument without overstating the case or introducing outside information.

Key Concept

Logical Continuations require synthesizing the author's main point and following their line of reasoning to its natural conclusion without introducing unsupported external claims or extreme generalizations.
Estimated Time:2m 30s
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Topics

Logical Continuations

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