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Question

Difficulty: MediumWeaken

Paleontologist: Fossil specimens of *Eoconstrictor*, an ancient snake from the Eocene epoch, exhibit cranial and vertebral adaptations characteristic of modern arboreal snakes that hunt in high forest canopies. Additionally, fossilized stomach contents from three distinct specimens contain remains of an arboreal lizard species. Therefore, *Eoconstrictor* must have hunted primarily in tree canopies rather than foraging along the forest floor.

Which of the following statements, if true, undermine the paleontologist's argument? Select all that apply.

  1. The arboreal lizard species identified in the gut contents spent substantial periods basking on the forest floor, where it was most easily ambushed.Answer
  2. B
    Modern snakes sharing the cranial and vertebral adaptations of *Eoconstrictor* capture more than ninety percent of their prey in tree canopies.
  3. Biomechanical models indicate that the bone density and mass of *Eoconstrictor* would have prevented it from climbing or navigating slender canopy branches.Answer
  4. D
    Fossilized stomach contents from predatory reptiles of the Eocene epoch are rarely preserved well enough to identify prey species reliably.
  5. E
    Other predatory reptiles living in the same Eocene ecosystem preyed upon ground-dwelling rodents rather than arboreal lizards.

Answer

The statements showing that the prey was accessible on the forest floor and that the predator had physical constraints preventing canopy climbing both undermine the conclusion.
The argument concludes that the predator hunted primarily in tree canopies based on two premises: anatomical similarity to modern arboreal snakes and the presence of arboreal lizard remains in its stomach. The statements that weaken this reasoning show that the arboreal lizard prey was accessible on the forest floor during basking and that the predator possessed physical traits that made climbing into canopies biomechanically unfeasible.

Step-by-Step Solution

1
Identify the argument's premises and main conclusion
Premises: The snake exhibits skeletal traits seen in canopy hunters, and its stomach contents contained an arboreal lizard. Conclusion: The snake hunted primarily in tree canopies rather than on the forest floor.
Clarifying the conclusion and supporting evidence reveals the core assumption: that anatomical similarity and prey identity necessarily imply canopy foraging behavior.
2
Identify potential vulnerabilities and alternative explanations
The argument assumes that arboreal prey could only be caught in trees and that morphological traits definitively indicate canopy locomotion.
Weakeners will either offer an alternative explanation for how canopy prey was consumed on the ground or demonstrate why canopy hunting was improbable.
3
Evaluate each choice to identify all statements that weaken the reasoning
The choice showing that the lizards basked on the ground severs the link between prey type and canopy hunting, while the choice showing biomechanical climbing limitations directly counters the feasibility of canopy hunting.
Both statements independently introduce evidence that diminishes the plausibility of the paleontologist's conclusion.

Key Concept

Identifying alternative explanations and physical constraints to weaken causal and behavioral inferences
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