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Question

Difficulty: Very hardParagraph-Level Transitions

The following paragraphs are from an essay about paleoclimatology.

For decades, paleoclimatologists have relied on ice cores drilled from polar ice sheets to reconstruct the Earth's atmospheric history. As snow accumulates and compacts into glacial ice, it traps tiny bubbles of ambient air. By analyzing the chemical composition of these bubbles, researchers can construct a precise timeline of ancient greenhouse gas levels, yielding a direct record that spans hundreds of thousands of years.

[1] Consequently, climate modelers use these reconstructed profiles to calibrate their computer simulations. By testing whether their models can accurately replicate past climate shifts, scientists can project future temperature trajectories with greater confidence.

Which choice provides the most effective transition from the preceding paragraph?

  1. A
    Consequently, climate modelers use these reconstructed profiles
  2. While these chemical records offer a glimpse into the distant past, their primary value lies in helping climate modelersAnswer
  3. C
    These records reveal the composition of ancient air, they are now utilized by climate modelers
  4. D
    In addition of illustrating the ancient past, this historical data is utilized by climate modelers

Answer

The choice that begins with a concession about the chemical records offering a glimpse into the past and transitions to their value in helping climate modelers is the correct answer.
The correct choice establishes a clear, logical bridge by referencing the historical nature of the records mentioned in the first paragraph ('glimpse into the distant past') and connecting them to their practical application by climate modelers discussed in the second paragraph. It is also grammatically correct.

Step-by-Step Solution

1
Analyze the relationship between the two paragraphs.
The first paragraph explains how scientists build a historical atmospheric record from ice cores, while the second paragraph describes how computer modelers use this record to calibrate climate models and project future trajectories.
Understanding the core focus of both paragraphs is essential to identifying a transition that bridges them logically.
2
Identify the key components needed in the transition.
The ideal transition must reference both the historical records of the past and their application to modern predictive modeling.
A paragraph transition must connect the ideas of the preceding paragraph with those of the following paragraph.
3
Eliminate options with grammatical errors.
The option containing 'they are now utilized' is a comma splice, and the option containing 'In addition of' uses an incorrect prepositional idiom.
ACT English questions require candidates to eliminate choices that violate conventions of standard written English.
4
Evaluate the remaining options for logical coherence.
The option starting with 'Consequently' is rhetorically weak because it implies an inaccurate cause-and-effect relationship, whereas the option starting with 'While these chemical records...' successfully establishes the logical bridge.
Comparing the rhetorical strength of the grammatically correct options reveals the most effective transition.

Key Concept

Paragraph-Level Transitions
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Topics

Paragraph-Level Transitions

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