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Difficulty: HardBridging Gap (Supporter) Assumptions

Public Health Official: A newly constructed water treatment facility in the county uses a chemical agent called Florazine to eliminate bacterial contaminants. Florazine has been proven in laboratory settings to neutralize beneficial aquatic microbes alongside harmful bacteria. Because these beneficial microbes are critical for breaking down heavy metals in the water supply, implementing this new treatment process will ultimately lead to a rise in neurological disorders among county residents.

Which of the following statements must be assumed for the public health official's conclusion to be logically drawn? Select all that apply.

  1. The presence of unbroken-down heavy metals in the county's water supply increases the risk of neurological disorders among its residents.Answer
  2. The concentration of Florazine used at the new facility is sufficient to neutralize enough beneficial microbes to impede the breakdown of heavy metals.Answer
  3. C
    Neurological disorders are the most severe health consequence associated with the consumption of heavy metals in a municipal water supply.
  4. D
    Any resident who consumes water from the new treatment facility will inevitably develop a neurological disorder.
  5. E
    If a county resident experiences a neurological disorder, it is primarily because they were exposed to heavy metals from the water supply.

Answer

The correct assumptions are that the presence of heavy metals increases the risk of neurological disorders, and that the concentration of Florazine used at the facility is sufficient to impede the breakdown of these metals.
The argument contains two distinct conceptual gaps. First, it introduces 'neurological disorders' in the conclusion without logically linking it to the 'heavy metals' mentioned in the premises. Second, it assumes that a chemical's behavior in a laboratory setting will translate exactly to the operational reality of the new facility. The correct choices explicitly bridge these two specific gaps; without them, the causal chain from utilizing Florazine to experiencing a rise in neurological disorders is broken.

Step-by-Step Solution

1
Deconstruct the argument to separate premises from the conclusion.
Premises: Florazine neutralizes beneficial microbes that break down heavy metals. Conclusion: Using Florazine will lead to a rise in neurological disorders.
Identifying the structural components is required to spot conceptual gaps.
2
Identify rogue elements and conceptual leaps.
The concept of 'neurological disorders' appears only in the conclusion. There is also a leap from Florazine's effects 'in laboratory settings' to its effects at the actual 'water treatment facility'.
Supporter assumptions are strictly necessary to connect new conclusion concepts back to the premises.
3
Evaluate the options using the Negation Test.
Negating the statement about heavy metals causing disorders destroys the conclusion. Negating the statement about Florazine concentrations at the facility being sufficient also destroys the conclusion.
The Negation Test confirms whether an assumption is strictly logically required.

Key Concept

Bridging Gap (Supporter) Assumptions
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Topics

Bridging Gap (Supporter) Assumptions

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