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Zorluk: ZorEvaluating Argument Strength and Credibility

Passage

In 2017, researchers claimed that 130,000-year-old mastodon bones found in California showed signs of modification by hominins using stone hammers. Since this predates the widely accepted arrival of humans in the Americas by over 100,000 years, the claim met severe skepticism. Critics argued that the spiral fractures and impact marks on the bones could have been caused by heavy construction equipment that excavated the site in the 1990s, or by natural processes like trampling by ancient megafauna. To defend their thesis, the original team conducted a control study: they used bone-breaking experiments with replica stone tools and compared the microscopic wear patterns to those on the fossilized mastodon bones. They reported that the ancient patterns were virtually indistinguishable from their experimental results. However, independent taphonomists noted that the team failed to run similar experiments replicating the effects of heavy machinery or sediment compaction, leaving alternative causes untested.

Based on the passage, which of the following statements best describes the primary weakness in the researchers' defense of the 130,000-year-old hominin claim?

  1. A
    They incorrectly assumed that the spiral fractures on the mastodon bones were identical to those produced by ancient megafauna trampling.
  2. B
    They based their argument on the assumption that replica stone tools behave differently than the original tools used by early hominins.
  3. Their replication experiments did not account for or attempt to reproduce the microscopic wear patterns that would be left by modern construction equipment or natural geological pressure.Cevap
  4. D
    They treated their successful replication of bone fractures as direct proof that hominins were present in California 130,000 years ago, rather than as supporting evidence for that claim.

Cevap

The correct answer is that the researchers' replication experiments did not account for or attempt to reproduce the microscopic wear patterns that would be left by modern construction equipment or natural geological pressure.
The correct answer is correct because the passage states that critics proposed alternative causes for the bone wear (heavy construction equipment and sediment compaction) and that the researchers failed to run experiments replicating these effects, leaving those alternative explanations untested.

Adım Adım Çözüm

1
Identify the main claim and the evidence presented in defense of it.
The claim is that hominins modified mastodon bones 130,000 years ago, supported by experiments showing replica stone tools created identical wear patterns to those on the fossils.
To evaluate argument strength, one must first identify the core claim and its backing.
2
Identify the counterarguments or alternative explanations raised by critics.
Critics argued that the bone damage could have been caused by heavy construction equipment in the 1990s or by natural sediment compaction.
Evaluating credibility requires comparing the original explanation against plausible alternative hypotheses.
3
Determine how the researchers addressed these counterarguments and identify the limitation in their approach.
While the researchers tested stone tool replication, they failed to test the effects of heavy machinery or compaction, leaving these alternative explanations unaddressed.
An argument is weakened when it fails to control for or rule out plausible alternative explanations that could produce the same empirical results.

Anahtar Kavram

Evaluating the strength of an argument by identifying untested alternative explanations and methodological limitations in supporting evidence.
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Konular

Evaluating Argument Strength and Credibility

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