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Bunuel
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hey! i also have the same doubt .
quiaitaque
Hi Bunuel,

I understand that D is the most effective weakener.
But cant it be argued that E too weakens the statement. Since the fact that spiders are in inaccessible spaces would imply that the chances of getting caught (spiders) are less likely. Thus, reducing the chances of them getting extinct.

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pikachu9
hey! i also have the same doubt .

pikachu9 quiaitaque Your analysis of choice E has identified something true: if spiders live in inaccessible places, they would be harder to catch. However, the conclusion states that continued production "must inevitably" lead to extinction.

Why Choice E Doesn't Truly Weaken:

Think about it this way: If we need spider webs for the drug, and the only way to get webs is by catching spiders (which is what the argument assumes), then:

  • Inaccessible location → Takes longer to catch 1,000 spiders
  • But we still need to catch them to get their webs
  • Result: Extinction happens slowly, but still inevitably

Choice E essentially says "extinction will take 50 years instead of 5 years" - but that doesn't challenge the claim that it's inevitable.

Why Choice D Actually Breaks the Argument:

Choice D reveals that spiders abandon their old webs each night. This means:
  • We can collect abandoned webs
  • We never need to harm any spider
  • Production can continue forever without affecting spider population

This completely destroys the "inevitable extinction" conclusion - there's now zero connection between drug production and spider harm.

Strategic Framework - "Degree vs. Existence" Test:

When evaluating weakeners in CR, ask yourself:
  1. Does this choice challenge the existence of the problem? (Strong weakener)
  2. Or does it only affect the degree/speed of the problem? (Not a true weakener)

Choice D challenges existence (no extinction at all), while Choice E only affects degree (slower extinction).

Hope this helps clarify the doubt!
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Bunuel
An anesthetic that is highly effective and has no negative side effects can be produced only from the webs of a spider species that is endangered in the wild. It takes 1,000 webs to make 1 gram of the drug. It follows, therefore, that continued production of the drug must inevitably lead to the species’ extinction.

Which of the following, if true, most seriously weakens the argument above?

A. The anesthetic made from the spiders’ webs is widely distributed.

B. The anesthetic made from the spiders’ webs is expensive to manufacture.

C. Parts from the spiders are used to produce other medications.

D. Each night the spiders spin new webs and abandon the old webs.

E. The spiders live in very inaccessible places­

KAPLAN OFFICIAL SOLUTION:



Correct Choice: (D)

The conclusion is that production of the drug must lead to the spiders’ extinction. The evidence is that it can only be obtained from the webs of a species that is endangered. So the assumption is that collecting the webs will kill the spiders. But if, as choice (D) suggests, the spiders move on to a new web every day, scientists might be able to collect the old webs without endangering the species.

Choices (A) and (C) both provide more reasons that there will be a very wide demand for the spiders and their webs, and thus further support the conclusion.

Choices (B) and (E) suggest that the anesthetic will be difficult and expensive to manufacture, but cannot guarantee that demand will not provide motivation to overcome these obstacles.
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