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Zorluk: OrtaIdentifying Necessary Assumptions

Paleontologist: Fossilized remains of the ancient amphibian *Dendrerpeton* have been found exclusively in geological formations corresponding to harsh, arid desert environments of the late Carboniferous period. Since all modern amphibians require constant access to substantial bodies of freshwater to survive, *Dendrerpeton* must have possessed specialized physiological adaptations for water retention that modern amphibians lack.

Which one of the following is an assumption on which the paleontologist's argument depends?

  1. A
    Any ancient amphibian that possessed specialized physiological adaptations for water retention lived in harsh, arid desert environments.
  2. B
    No other species of amphibian lived in the harsh, arid desert environments of the late Carboniferous period.
  3. The *Dendrerpeton* fossils discovered in the arid geological formations belong to individuals that actually lived in those desert environments.Cevap
  4. D
    *Dendrerpeton* possessed a thick, impermeable epidermis that completely prevented moisture loss from its body.
  5. E
    Modern amphibians share a significant amount of genetic material and evolutionary lineage with *Dendrerpeton*.

Cevap

The correct answer is the statement that the fossils belong to individuals that actually lived in those desert environments.
The argument assumes that the discovery of fossils in a desert formation proves the animal actually inhabited that desert while alive. If the animals did not live in the desert (for instance, if their remains were washed there from a distant wetland), the conclusion that they must have possessed desert survival adaptations would be completely baseless. Therefore, ruling out this alternative explanation is logically necessary for the argument to hold.

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1
Analyze the argument's structure and identify the premises and conclusion.
Premises: Fossils of Dendrerpeton are only found in desert formations; modern amphibians need freshwater. Conclusion: Dendrerpeton had special physiological adaptations for water retention.
Understanding the structural components is required to locate the logical gap between the evidence provided and the final conclusion.
2
Identify the logical gap or potential weakness in the reasoning.
The argument assumes that the location where the fossils were found is the exact same environment where the animals lived and needed to survive.
If the animals died elsewhere and their remains were merely transported to the desert post-mortem, they would not have needed desert survival adaptations.
3
Apply the Negation Technique to the prospective correct answer.
Negating the correct option yields: 'The individuals did not actually live in those desert environments.' This destroys the argument because it removes the environmental pressure that necessitates the adaptations.
A necessary assumption is one that, if proven false, completely collapses the argument's logic.

Anahtar Kavram

Identifying a 'Defender' assumption that rules out an alternative explanation.
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Konular

Identifying Necessary Assumptions

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