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Difficulty: MediumIdentifying Necessary Assumptions

Marine Biologist: The rapid proliferation of the spiny sea urchin is devastating our region's kelp forests. To prevent the complete loss of these forests, conservationists plan to introduce the sunflower sea star, a natural predator of the urchin. Because the sunflower sea star actively hunts these urchins and does not consume kelp, this introduction will successfully halt the destruction of the kelp forests.

Statement: The marine biologist's argument logically depends on the assumption that introducing the sunflower sea star will eliminate the spiny sea urchin population entirely.

Answer: Answer

Answer

False. The argument does not require the complete elimination of the urchin population, only a reduction sufficient to halt the destruction of the kelp forests.
The statement is false because it presents an extreme condition rather than a necessary one. Applying the Negation Technique reveals that the argument's conclusion (halting the destruction) can still stand even if the urchin population is not completely eradicated.

Step-by-Step Solution

1
Identify the core components of the argument.
Conclusion: Introducing the sea star will successfully halt the destruction of the kelp forests. Premises: Sea stars eat urchins and do not eat kelp.
Understanding the exact wording and scope of the conclusion is necessary to evaluate what is strictly required for the argument to hold.
2
Apply the Negation Technique to the proposed assumption.
Negated statement: 'Introducing the sunflower sea star will NOT eliminate the spiny sea urchin population entirely.'
The Negation Technique tests necessity; if an argument's conclusion survives the logical negation of a statement, that statement is not a necessary assumption.
3
Evaluate the impact of the negated statement on the argument's conclusion.
If the sea star does not entirely eliminate the urchins, but instead reduces their population by 90%, the destruction of the kelp forests could still be successfully halted. The argument does not collapse.
Because the conclusion can still logically follow even if the proposed assumption is false, the proposed assumption overreaches and is not strictly necessary.

Key Concept

Identifying Necessary Assumptions using the Negation Technique and recognizing quantifier overreach.
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Identifying Necessary Assumptions

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