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Difficulty: HardFlaw in the Reasoning

Ornithologist: Recent field observations demonstrate that songbird populations inhabiting fragmented urban woodlands exhibit significantly higher rates of aggressive territorial vocalizations than do populations of the same species in continuous rural forests. Because urban forest fragments have substantially higher ambient noise levels from traffic, these birds must be producing aggressive vocalizations primarily as an adaptive response to acoustic interference from traffic noise.

Which one of the following most accurately describes a flaw in the ornithologist's reasoning?

  1. A
    presumes that an environmental condition that can contribute to behavioral change is a necessary precondition for such change
  2. B
    infers that all avian species inhabit fragmented woodlands solely from evidence about a single songbird species
  3. concludes that a particular environmental factor is the cause of a behavioral difference without accounting for other plausible differences between the environmentsAnswer
  4. D
    attempts to dispute the observed disparity in vocalization rates by questioning the reliability of the baseline rural field recordings
  5. E
    mistakes a claim that functions as an intermediate conclusion for the main conclusion of the argument

Answer

The argument concludes that a particular environmental factor is the cause of a behavioral difference without accounting for other plausible differences between the environments.
The author observes a behavioral difference between populations in two distinct environments (fragmented urban woodlands versus continuous rural forests) and notes one specific environmental characteristic (traffic noise). The author then concludes that this single characteristic is the primary cause of the behavioral difference. This is flawed because fragmented urban woodlands differ from continuous rural forests in many other respects—such as habitat patch size, food resource distribution, territory density, and human activity—any of which could account for the increased territorial aggression.

Step-by-Step Solution

1
Analyze the argument structure and isolate the premises from the conclusion
Premises: (1) Urban fragmented woodland songbirds have higher rates of aggressive territorial vocalizations than rural continuous forest songbirds. (2) Urban forest fragments have higher ambient noise levels from traffic. Conclusion: The birds produce aggressive vocalizations primarily as an adaptive response to traffic noise.
Identifying the exact boundary between evidence and claim is necessary to evaluate the logical leap.
2
Evaluate the inferential gap between the premises and the conclusion
The premises show a correlation between an urban environment (with traffic noise) and aggressive vocalizations. The author concludes that traffic noise is the primary causal agent, failing to consider other differences inherent to urban forest fragments (e.g., higher territory density, reduced patch size, food competition, predator presence).
Establishing that two factors coincide does not establish that one factor is the sole or primary cause of the observed effect when other confounding variables exist.
3
Match the identified vulnerability to the answer choice that precisely captures it in abstract terms
The choice stating that the argument concludes a specific factor is the cause without accounting for other plausible differences between the environments perfectly characterizes this causal overreach.
LSAT Flaw questions require selecting an accurate description of the reasoning vulnerability demonstrated in the stimulus.

Key Concept

Causal Overreach and Confounding Variables
Estimated Time:1m 20s
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Topics

Flaw in the Reasoning

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