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Difficulty: Very hardComposition and Division (Part to Whole)

Ecologist: The newly analyzed deep-sea hydrothermal vent network—a complex, interconnected biosphere comprising thousands of distinct organisms—exhibits remarkable metabolic stability even when localized volcanic activity severely disrupts chemical nutrient flows. Consequently, the newly discovered Thermotoga profunda bacterium, which acts as a primary energy producer within this network, must individually maintain extreme metabolic stability during severe fluctuations in chemical nutrient availability.

The ecologist's argument is most vulnerable to criticism on the grounds that it:

  1. infers that a particular component of a biological system possesses a certain trait solely because the biological system as a whole possesses that traitAnswer
  2. B
    ignores the possibility that the metabolic stability of the overall network is caused by factors other than the stability of its primary energy producers
  3. C
    shifts the meaning of the phrase "metabolic stability" from a collective ecological measure in the premises to an individual physiological measure in the conclusion
  4. D
    presumes, without providing sufficient justification, that a condition necessary for the survival of the biosphere is also sufficient for the survival of a specific bacterium
  5. E
    treats a statement about the entirety of a system as if it were a statement about the majority of the components within that system

Answer

The option stating that the argument infers a component possesses a certain trait solely because the system as a whole possesses it.
The correct answer accurately diagnoses the Error of Division. The ecologist observes that the macro-system (the vent network) has a specific characteristic (metabolic stability) and illogically assumes that a micro-component of that system (the T. profunda bacterium) must also possess that exact same characteristic. In reality, an ecosystem might maintain overall stability precisely because individual, highly sensitive components die off and are rapidly replaced, meaning the specific part is not stable at all.

Step-by-Step Solution

1
Deconstruct the argument into its core premise and conclusion.
Premise: The deep-sea vent network (the whole) has metabolic stability. Conclusion: The T. profunda bacterium (a part) has metabolic stability.
Identifying the structural relationship between the evidence and the claim is essential for spotting logical flaws.
2
Identify the structural gap in the reasoning.
The author moves directly from an observation about a macroscopic entity to a claim about a microscopic constituent of that entity.
Recognizing that the argument attributes a property of a group to an individual member reveals the specific fallacy.
3
Name the specific logical fallacy committed.
The argument commits the Error of Division (Part-to-Whole Fallacy).
A system as a whole can be highly stable precisely because its individual parts are unstable, rapidly dying, and being replaced. What is true of the whole is not necessarily true of the parts.
4
Evaluate the answer choices to find the one that abstractly describes the Error of Division.
The correct option abstractly describes inferring a component possesses a trait because the biological system possesses it.
This matches the definition of the division flaw observed in step 3.

Key Concept

Error of Division (Whole-to-Part Fallacy)
Estimated Time:2m 0s
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Topics

Composition and Division (Part to Whole)

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