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Question

Difficulty: HardPart-to-Whole Rhetorical Function

In archaeological science, stable isotope analysis of nitrogen (15N^{15}\text{N}) in bone collagen has long been used to reconstruct the dietary profiles of ancient populations, with elevated values typically associated with high consumption of animal or marine proteins. However, recent studies by biochemist Elena Moreno and colleagues demonstrate that environmental factors, such as prolonged soil aridity and specific agricultural fertilization practices, can artificially elevate bone nitrogen levels in herbivores, thereby mimicking a high-meat diet in the consumer record. Consequently, researchers must now cross-reference isotopic data with archaeobotanical evidence of local water availability before drawing conclusions about ancestral foodways. This methodological refinement suggests that previous estimates of meat consumption in early agricultural societies may have been significantly overestimated.

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

  1. A
    It states the main conclusion of the passage regarding the diet of early agricultural societies.
  2. B
    It summarizes the author's primary purpose of demonstrating that stable isotope analysis is an obsolete archaeological methodology.
  3. It presents evidence demonstrating that a specific chemical signature can be influenced by variables other than those traditionally assumed.Answer
  4. D
    It establishes that early agricultural communities consumed far less animal protein than previously documented.

Answer

The correct answer is the option stating that the underlined sentence presents evidence demonstrating that a specific chemical signature can be influenced by variables other than those traditionally assumed.
The correct option is correct because the passage explains that nitrogen-15 has long been used as a dietary marker for meat consumption, but the underlined sentence introduces research showing that other factors, like soil aridity and fertilization, can also cause elevated nitrogen levels. Therefore, it functions to show that the chemical signature can be influenced by variables other than the assumed dietary ones.

Step-by-Step Solution

1
Analyze the context before the underlined sentence.
The text establishes that nitrogen-15 levels in bone collagen are traditionally used as a chemical marker to infer high-meat diets in ancient populations.
Understanding the baseline scientific assumption is necessary to identify how the underlined sentence functions in relation to it.
2
Examine the role of the underlined sentence.
The sentence introduces new research showing that environmental factors (like aridity and fertilization) can also cause elevated nitrogen levels, mimicking the meat-consumption marker.
Determining the direct impact of the underlined sentence reveals that it introduces variables that complicate the traditional interpretation of the chemical marker.
3
Analyze the context following the underlined sentence.
The text states that researchers must now cross-reference their data with other evidence, indicating that previous dietary estimates might be inaccurate.
Analyzing the rest of the text confirms that the underlined sentence provides the logical justification for the subsequent methodological adjustment.

Key Concept

Identifying how a specific sentence contributes to the logical development of an argument in a passage.
Estimated Time:2m 0s
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Part-to-Whole Rhetorical Function

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