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Question

Difficulty: HardPart-to-Whole Rhetorical Function

For decades, biologists hypothesized that migratory songbirds navigate using magnetoreception, a biological sense that allows them to detect the Earth’s magnetic field. However, early laboratory experiments designed to demonstrate this ability produced highly inconsistent results because the artificial magnetic fields used did not accurately replicate the subtle fluctuations of the natural geomagnetic field. Consequently, many researchers temporarily dismissed the hypothesis in favor of celestial navigation theories. It was not until later field studies employed dynamic, high-fidelity magnetic simulators that scientists confirmed that songbirds do indeed rely on magnetoreception, using it in tandem with visual cues.

Which choice best describes the function of the underlined sentence in the text as a whole?

  1. A
    It summarizes the ultimate scientific consensus regarding the primary sensory cues used by migratory songbirds.
  2. It identifies a methodological limitation in early research that accounts for the initial skepticism surrounding a biological hypothesis.Answer
  3. C
    It presents empirical data showing that celestial navigation is the primary method of navigation for migratory songbirds.
  4. D
    It suggests that songbirds are unable to navigate when both artificial and natural magnetic fields are present simultaneously.

Answer

The correct answer is the option that explains how the underlined sentence identifies a methodological limitation in early research that accounts for the initial skepticism surrounding a biological hypothesis.
The correct answer identifies that the underlined sentence functions to point out a flaw in the design of early laboratory experiments—specifically, that the artificial magnetic fields did not replicate the subtle fluctuations of natural geomagnetic fields. This explanation of a methodological weakness directly accounts for why early tests yielded inconsistent results, which in turn explains the temporary skepticism and dismissal of the magnetoreception hypothesis described in the subsequent sentence.

Step-by-Step Solution

1
Analyze the underlined sentence to identify its main point.
The underlined sentence states that early laboratory experiments failed to produce consistent results because the artificial magnetic fields did not accurately replicate natural geomagnetic fluctuations.
Understanding the precise claim in the underlined portion is necessary to evaluate its function.
2
Analyze the surrounding context to see how the underlined sentence relates to the rest of the text.
The text begins by introducing the hypothesis of magnetoreception. The underlined sentence explains why early tests of this hypothesis failed. The next sentence shows the result of this failure: researchers temporarily dismissed the hypothesis. The final sentence shows how later, improved testing confirmed the hypothesis.
Determining how the sentence connects to the preceding hypothesis and the subsequent skepticism establishes the part-to-whole relationship.
3
Synthesize the function of the sentence and evaluate the options.
The underlined sentence functions to explain a flaw in early experimental methods (a methodological limitation) that explains why the hypothesis was initially met with skepticism. This directly matches the correct option.
Matching the synthesized function to the correct option ensures accuracy.

Key Concept

Identifying how a specific sentence or section of a text contributes to the development of the author's overall argument or narrative.
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Topics

Part-to-Whole Rhetorical Function

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