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Difficulty: HardComparative Relationships

Passage A
For decades, the dominant explanation for the extinction of North American megafauna at the end of the Pleistocene epoch was the "overkill hypothesis," which posits that Clovis hunters, armed with sophisticated spear points, rapidly decimated species like mammoths and mastodons. Proponents of this view point to the chronological alignment between human arrival and the sudden disappearance of these large mammals. They argue that megafauna, having evolved in the absence of human predators, lacked the necessary defensive behaviors to survive these new, highly efficient hunters.

Passage B
Conversely, many paleontologists now argue that climatic shifts at the end of the Last Glacial Maximum were the primary driver of megafaunal extinctions. As temperatures rose rapidly, the highly specialized habitats of North America fragmented, disrupting the complex plant communities that sustained large herbivores. Rather than a sudden onslaught by human hunters, the extinctions were a gradual process of ecological attrition. While humans may have hunted some megafauna, their impact was secondary to the sweeping environmental pressures that had already pushed these species to the brink.

Which of the following statements best describes a key difference in how the authors of Passage A and Passage B explain the extinction of North American megafauna?

  1. A
    The author of Passage A claims that megafauna quickly developed defensive behaviors to escape Clovis hunters, while the author of Passage B argues that humans never hunted megafauna.
  2. B
    The author of Passage A focuses on the technological sophistication of Clovis spear points, while the author of Passage B focuses on the specific plant species that herbivores ate.
  3. The author of Passage A attributes the extinction primarily to the arrival of human predators, whereas the author of Passage B attributes it primarily to habitat fragmentation caused by climatic shifts.Answer
  4. D
    The author of Passage A asserts that human hunting took place over thousands of years prior to the extinction, while the author of Passage B states that climate change occurred instantly.

Answer

The author of Passage A attributes the extinction primarily to the arrival of human predators, whereas the author of Passage B attributes it primarily to habitat fragmentation caused by climatic shifts.
The correct option correctly captures the central comparative relationship between the two passages. Passage A explains the extinction through the 'overkill hypothesis,' which identifies human Clovis hunters as the primary cause. In contrast, Passage B argues that climatic shifts were the primary driver, leading to habitat fragmentation and ecological attrition, with human hunting being merely a secondary factor.

Step-by-Step Solution

1
Identify the primary explanation in Passage A.
Passage A describes the 'overkill hypothesis,' which links the extinction directly to human arrival and hunting.
Understanding the first author's main argument is the baseline for comparison.
2
Identify the primary explanation in Passage B.
Passage B focuses on climatic shifts and habitat fragmentation, describing human hunting as a secondary factor.
Understanding the second author's main argument allows for direct contrast.
3
Contrast the two primary explanations and match with the options.
The core divergence is human predation (Passage A) versus climate-driven habitat changes (Passage B).
Selecting the option that accurately describes this distinction leads to the correct answer.

Key Concept

Identifying and contrasting the primary explanations or arguments presented in paired passages.
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Topics

Comparative Relationships

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