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Difficulty: EasyOverall Text Structure Analysis

Many marine biologists assert that kelp forests play a vital role in coastal defense by reducing wave energy. To evaluate this claim, researchers measured wave heights before and after they passed through a dense kelp canopy off the coast of California. The study revealed that wave height decreased by up to sixty percent within the canopy, with denser sections providing the greatest reduction. Furthermore, the researchers found that this wave dampening significantly mitigates shoreline erosion in adjacent coastal zones. These findings confirm that kelp forests serve as a natural barrier, protecting coastlines from strong ocean waves.

Which choice best describes the overall structure of the text?

  1. It presents a scientific claim, describes a study designed to test it, and summarizes the findings that confirm the claim.Answer
  2. B
    It argues against a popular ecological hypothesis, presents evidence showing its flaws, and proposes an alternative explanation.
  3. C
    It outlines a historical timeline of shoreline erosion, explains how waves are measured, and criticizes researchers for failing to protect kelp forests.
  4. D
    It highlights the physical features of kelp leaves, contrasts them with other marine plants, and argues that kelp should be introduced to new coastal regions.

Answer

It presents a scientific claim, describes a study designed to test it, and summarizes the findings that confirm the claim.
The correct answer accurately describes the rhetorical sequence of the passage: it starts with a claim about kelp forests reducing wave energy, describes a study measuring wave heights, and concludes with findings that confirm the claim.

Step-by-Step Solution

1
Analyze the beginning of the passage to identify the starting point of the text.
The passage starts by introducing the idea/assertion that kelp forests protect coastlines by reducing wave energy.
This establishes the core scientific claim being examined in the text.
2
Analyze the middle of the passage to see how the text transitions from the opening.
The text describes a study where researchers measured wave heights before and after passing through a kelp canopy.
This serves as the method/study designed to evaluate or test the claim.
3
Analyze the end of the passage to identify the conclusion.
The passage details the findings of the study (wave height reduction and mitigation of erosion) and states that these findings confirm the initial claim.
This summarizes the findings that support and validate the claim, completing the structural flow.

Key Concept

Identifying the organizational structure of a passage by tracing the sequence of its main ideas and rhetorical moves.
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Overall Text Structure Analysis

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