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Difficulty: MediumWeaken

Paleontologist: Fossils of the extinct dire wolf are frequently found in the exact same sedimentary layers as the remains of large, herbivorous megafauna. Because dire wolves possessed exceptionally robust jaws and teeth capable of crushing thick bones, it is clear that they primarily hunted and brought down these large herbivores.

Statement: The paleontologist's argument is actively weakened by the newly discovered fact that the bone-crushing jaw structure of the dire wolf is anatomically identical to that of modern specialized scavengers, which feed exclusively on the abandoned carcasses of animals killed by other predators.

Answer: Answer

Answer

True. The newly introduced fact actively weakens the paleontologist's argument.
The statement is objectively true. The newly introduced fact provides a highly plausible alternative explanation for why the dire wolf had bone-crushing jaws and why it was found near large carcasses. If dire wolves were scavengers, the paleontologist's conclusion that they hunted and brought down large herbivores is severely undermined.

Step-by-Step Solution

1
Identify the argument's conclusion and premises.
Conclusion: Dire wolves primarily hunted and brought down large herbivores. Premises: Their fossils are found near megafauna, and they possessed bone-crushing jaws.
To evaluate the impact of new evidence, one must isolate the exact claim the author is attempting to prove.
2
Identify the logical gap or assumption connecting the premises to the conclusion.
The paleontologist assumes that having bone-crushing jaws is a trait exclusively indicating an active hunter of large prey, ignoring other evolutionary reasons for such jaws.
Arguments are most effectively weakened by attacking their unstated assumptions.
3
Evaluate the impact of the new factual assertion on this assumption.
The new fact demonstrates that bone-crushing jaws are a characteristic trait of specialized scavengers that do not hunt.
Determining whether the new information exposes the logical gap.
4
Determine if the conclusion is rendered less likely to be true.
Since the evidence (jaws and fossil proximity) can now be perfectly explained by scavenging behavior, the conclusion that they actively hunted is significantly undermined.
To form the final judgment on whether the argument is effectively weakened.

Key Concept

Weakening an argument by introducing an alternative explanation for the presented evidence.
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