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Difficulty: MediumPart-to-Whole Rhetorical Function

Phytoliths—microscopic silica structures formed within plant tissues—are remarkably resilient, often surviving in the soil long after the organic components of a plant have decayed. Archeologists have long used these microfossils to identify the crops cultivated by ancient societies. However, because phytoliths can be transported by wind and water, their presence at an archaeological site does not automatically prove that those plants were consumed or cultivated there. Consequently, modern researchers now pair phytolith analysis with chemical residue analysis of cooking vessels. By verifying that plant lipids are absorbed into the ceramic matrix, scientists can confirm whether the plants identified through phytoliths were actually processed by the site's inhabitants.

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

  1. A
    It summarizes the overall findings of researchers regarding the agricultural practices of ancient civilizations.
  2. B
    It presents scientific evidence showing how natural forces cause phytolith structures to degrade over time.
  3. It identifies a limitation in a traditional methodology to explain why a supplementary technique is required.Answer
  4. D
    It argues that chemical residue analysis is a more cost-effective method than analyzing soil microfossils.

Answer

The underlined sentence serves to identify a limitation in a traditional methodology to explain why a supplementary technique is required.
The correct answer states that the sentence identifies a limitation in a traditional methodology to explain why a supplementary technique is required. The passage begins by explaining how phytoliths are used to identify ancient crops, but the underlined sentence immediately introduces a critical limitation—phytoliths can be carried by wind or water, meaning their presence doesn't guarantee human usage. This limitation directly explains the necessity of the next step: pairing phytolith analysis with chemical residue analysis.

Step-by-Step Solution

1
Analyze the context established in the first two sentences of the passage.
The text explains that archaeologists use phytoliths (durable plant silica structures) to identify ancient crops.
Understanding the baseline methodology establishes what the underlined sentence is qualifying.
2
Examine the underlined sentence to identify its specific claim and logical role.
The underlined sentence points out a limitation: because phytoliths can be moved by wind and water, their presence doesn't confirm cultivation or consumption.
This identifies the rhetorical shift or caveat introduced by the sentence.
3
Examine the remaining sentences to see how they resolve or build on this claim.
The final sentences introduce chemical residue analysis as a complementary tool that confirms actual use by testing lipids in pottery.
This establishes that the limitation identified in the underlined sentence directly motivates the need for the second method.

Key Concept

Analyzing how a specific part of a passage functions rhetorically to establish a problem that is then addressed by subsequent sentences.
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Topics

Part-to-Whole Rhetorical Function

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