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Zorluk: Çok zorNecessary Assumption

Biologist: The presence of xylotoxin in the venom of the deep-sea viperfish has traditionally been explained as an evolutionary adaptation for immobilizing highly evasive prey. However, we now know that the viperfish's primary food source, the sluggish abyssal slug, possesses complete immunity to xylotoxin. Given that the viperfish only rarely encounters highly evasive species in its deep-sea habitat, the xylotoxin must actually serve a strictly non-predatory physiological function.

Evaluate the following statement regarding the argument above:

The biologist's argument logically depends on the assumption that an evolutionary trait cannot be maintained in a species exclusively for a predatory function that is utilized only on rare occasions.

Cevap: Cevap

Cevap

True
The statement is True because it articulates a bridge assumption required for the conclusion to hold. The author concludes that xylotoxin MUST have a non-predatory function solely because its predatory target is encountered 'only rarely'. For this definitive conclusion to be valid, it must be inherently true that rare usage is insufficient to exclusively maintain such an evolutionary trait. If rare usage were sufficient, the conclusion would immediately fail.

Adım Adım Çözüm

1
Identify the main conclusion and the premises supporting it.
Conclusion: Xylotoxin must serve a strictly non-predatory physiological function. Premises: Its primary prey is immune, and the evasive prey it was thought to target is only rarely encountered.
Deconstructing the argument is the essential first step in identifying logical gaps.
2
Analyze the logical gap between the premises and the conclusion.
The biologist jumps directly from 'the predatory function is used rarely' to the absolute claim that 'the toxin MUST serve a non-predatory function.'
Identifying the shift in scope or logic reveals what the author inherently takes for granted.
3
Apply the Negation Test to the provided statement.
Negated statement: 'An evolutionary trait CAN be maintained in a species exclusively for a predatory function that is utilized only on rare occasions.'
The Negation Test is the definitive method for proving if an assumption is strictly necessary.
4
Evaluate the impact of the negated statement on the argument's conclusion.
If the negated statement is true, the toxin could exist solely for those rare encounters, destroying the conclusion that it must serve a non-predatory function. Therefore, the original statement is strictly necessary.
If negating an assumption destroys the argument, the assumption is logically required.

Anahtar Kavram

Necessary Assumption and the Negation Test
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Konular

Necessary Assumption

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