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Only 1,000 to 2,000 species of fruit flies exist worldwide

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Only 1,000 to 2,000 species of fruit flies exist worldwide [#permalink]

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Only 1,000 to 2,000 species of fruit flies exist worldwide. Nowhere in the world are fruit flies more taxonomically diverse than in the Hawaiian islands, which host some 500 species. A subset of fruit flies called the picture-winged drosophilids is represented in Hawaii by 106 species. All of the fruit fly species now present in the Hawaiian archipelago are thought to be the descendants of the same one or two ancestral females.

Which one of the following can be inferred from the passage?

(A) All of the picture-winged drosophilids in Hawaii are believed to be the descendants of the same one or two ancestral female fruit flies.

(B) Picture-winged drosophilids are found only in the Hawaiian islands.

(C) All of the 1,000 to 2,000 species of fruit flies worldwide are believed to be the descendants of one or two females.

(D) If 500 new species of fruit flies were discovered, then Hawaiian fruit flies would no longer be the most taxonomically diverse
population.

(E) Some fruit flies originated in Hawaii and spread from there to other parts of the world.

Source: LSAT
[Reveal] Spoiler: OA

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Re: Only 1,000 to 2,000 species of fruit flies exist worldwide [#permalink]

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New post 12 Oct 2017, 18:26
The OA provided is restatement of the last line. Shouldn't an inference be anything else but a restatement? Isn't option d the right answer?

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Only 1,000 to 2,000 species of fruit flies exist worldwide [#permalink]

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SVP482 wrote:
The OA provided is restatement of the last line. Shouldn't an inference be anything else but a restatement? Isn't option d the right answer?



hi

I am sure that you are mistaking inferences for assumptions that cannot be something already stated

inferences, certainly, can be a restatement or paraphrasing of any of the premises, why? because inferences, just like conclusions, are deduced from the premises and are always "must be true"

assumptions, on the other hand, are some pieces of information that are not stated in the argument but have to be true for the conclusion to hold true

hope this helps

cheers through the kudos button if this helps
thanks
8-)

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Re: Only 1,000 to 2,000 species of fruit flies exist worldwide [#permalink]

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SVP482 wrote:
The OA provided is restatement of the last line. Shouldn't an inference be anything else but a restatement? Isn't option d the right answer?

Quote:
(A) All of the picture-winged drosophilids in Hawaii are believed to be the descendants of the same one or two ancestral female fruit flies.

An inference can sometimes be a simple rephrasing of given information. In this case, you technically have to synthesize information from the last two sentences:

  • In Hawaii, there are 106 species of a subset of fruit flies called the picture-winged drosophilids.
  • Since "all of the fruit fly species now present in the Hawaiian archipelago are thought to be the descendants of the same one or two ancestral females," all of the picture-winged drosophilids in Hawaii are also thought to be the descendants of the same one or two ancestral female fruit flies.

This might seem fairly obvious, but it is a valid inference. More importantly, see how you can eliminate the other choices. For example:

Quote:
(D) If 500 new species of fruit flies were discovered, then Hawaiian fruit flies would no longer be the most taxonomically diverse
population.

Choice (D) is not necessarily true. What if those 500 new species are discovered in numerous locations all over the world (i.e. 50 new species in each of 10 different places)? It's possible that Hawaii would no longer be the most taxonomically diverse place, but without information about the numbers in other places after the discovery, we can't know for sure.
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Kudos [?]: 1874 [1], given: 449

Re: Only 1,000 to 2,000 species of fruit flies exist worldwide   [#permalink] 19 Oct 2017, 21:18
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Only 1,000 to 2,000 species of fruit flies exist worldwide

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