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Recently, scientists determined that great white sharks can live over

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Recently, scientists determined that great white sharks can live over  [#permalink]

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New post Updated on: 08 Sep 2018, 01:41
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Recently, scientists determined that great white sharks can live over 70 years, much longer than had been previously thought. They made the discovery by examining the layers of different colors that accumulated on the shark's teeth over the years. In the 1950s, atomic bomb testing produced unusually large amounts of carbon-14, which fell from the atmosphere into the ocean and accumulated as a distinctive layer on the shark's teeth corresponding to a known period in time. Perplexingly, even though great white sharks live longer than had been expected, some parties maintain that based on the new findings, the great white sharks must be protected from overfishing.

Which of the following, if true, best resolves the discrepancy identified above?


A. Great white sharks need to be protected from overfishing because they are dying rapidly due to poisoning by carbon-14.

B. Great white sharks were determined to live longer than had been previously thought based on the discovery of a carbon-14-rich layer within older sharks' teeth.

C. Great white sharks are evidently endangered and therefore need to be protected from overfishing.

D. Some great white sharks may have rich layers of carbon-14 from other sources, depending on their migration patterns.

E. Great white sharks' longer lifespan implies that they mature more slowly and reproduce more slowly than had previously been assumed.

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Originally posted by daagh on 27 Oct 2015, 20:34.
Last edited by Bunuel on 08 Sep 2018, 01:41, edited 2 times in total.
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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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New post 27 Oct 2015, 22:31
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1
daagh wrote:
Recently, scientists determined that great white sharks can live over 70 years, much longer than had been previously thought. They made the discovery by examining the layers of different colors that accumulated on the shark's teeth over the years. In the 1950s, atomic bomb testing produced unusually large amounts of carbon-14, which fell from the atmosphere into the ocean and accumulated as a distinctive layer on the shark's teeth corresponding to a known period in time. Perplexingly, even though great white sharks live longer than had been expected, some parties maintain that based on the new findings, the great white sharks must be protected from overfishing.

Which of the following, if true, best resolves the discrepancy identified above?


Great white sharks need to be protected from overfishing because they are dying rapidly due to poisoning by carbon-14.

Great white sharks were determined to live longer than had been previously thought based on the discovery of a carbon-14-rich layer within older sharks' teeth.

Great white sharks are evidently endangered and therefore need to be protected from overfishing.

Some great white sharks may have rich layers of carbon-14 from other sources, depending on their migration patterns.

Great white sharks' longer lifespan implies that they mature more slowly and reproduce more slowly than had previously been assumed.


OA/OE after three postings


Great white sharks need to be protected from overfishing because they are dying rapidly due to poisoning by carbon-14.no mention about poisoning. Don't know Cant say DKCS

Great white sharks were determined to live longer than had been previously thought based on the discovery of a carbon-14-rich layer within older sharks' teeth.dont explain desipency

Great white sharks are evidently endangered and therefore need to be protected from overfishing.fact but not explaining the descrepancy

Some great white sharks may have rich layers of carbon-14 from other sources, depending on their migration patterns.OFS

Great white sharks' longer lifespan implies that they mature more slowly and reproduce more slowly than had previously been assumed.correctly giving the relation between lifespan and overfishing

IMO E
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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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New post 28 Oct 2015, 07:20
[quote="daagh"]Recently, scientists determined that great white sharks can live over 70 years, much longer than had been previously thought. They made the discovery by examining the layers of different colors that accumulated on the shark's teeth over the years. In the 1950s, atomic bomb testing produced unusually large amounts of carbon-14, which fell from the atmosphere into the ocean and accumulated as a distinctive layer on the shark's teeth corresponding to a known period in time. Perplexingly, even though great white sharks live longer than had been expected, some parties maintain that based on the new findings, the great white sharks must be protected from overfishing.

Which of the following, if true, best resolves the discrepancy identified above?


Great white sharks need to be protected from overfishing because they are dying rapidly due to poisoning by carbon-14.

Great white sharks were determined to live longer than had been previously thought based on the discovery of a carbon-14-rich layer within older sharks' teeth.

Great white sharks are evidently endangered and therefore need to be protected from overfishing.

Some great white sharks may have rich layers of carbon-14 from other sources, depending on their migration patterns.

Great white sharks' longer lifespan implies that they mature more slowly and reproduce more slowly than had previously been assumed.


OA/OE after three postings[/quote

IMO E
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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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New post 28 Oct 2015, 07:39
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Explanation from GMAT FREE, the source

Reading the question: We have a long prompt and a short stem, so we check the stem. It says "resolve a discrepancy." That's the same as "explain." As discussed in Osprey Prey and Caller Complaints, since we are explaining, we should identify the two parts of the so-called "discrepancy." The correct answer will need to address both parts, without contradicting any of the facts given.

Creating a filter: "Perplexingly" is an important word, because it allows us to parse the prompt into two parts. The second, shorter part is that sharks must be protected from overfishing. Why is that perplexing? Because of whatever the main point of the first part is: sharks live longer than expected. We'll look for something that connects logically to both parts: 1) sharks live longer than expected, and 2) they must be protected.

Applying the filter: (A) doesn't connect to the sharks' age. Choice (B) just restates part of the prompt. Choice (C) just restates the other part of the prompt. Choice (D) doesn't connect to either portion of the discrepancy. Choice (E) touches on both parts: it says that if sharks are older than we thought, there are fewer of them than we thought. That's a good reason to protect them from overfishing.

Logical proof: A logical proof is not always possible on "explain" questions, but we can use the negation test to confirm (E), in this case. Suppose that sharks reproduced more quickly than had previously been assumed: that would lessen the need to protect sharks. Since the negation would add to the mystery and contradict the opinion of "some parties," we have confirmation the non-negated (E) would, indeed, resolve the mystery. The correct answer is (E).
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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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New post 29 Oct 2015, 02:43
E is the best answer, though I would have one question regarding D.

Would it be totally out of scope to assume that because "some great white sharks may have rich layers of carbon-14 from other sources," they might not live longer after all (since layers of carbon-14 were the main evidence for sharks' longer lifetime). If so, then the population might actually have decreased and therefore the overfishing must be taken under control.
This would in essence refute the accepted fact and it is probably out of scope. I was just wondering whether my reasoning was completely false in that case?

I chose E as well though, but it took me a while to cross off D.

Thank you guys for your help,
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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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New post 05 Mar 2016, 16:05
daagh wrote:
Recently, scientists determined that great white sharks can live over 70 years, much longer than had been previously thought. They made the discovery by examining the layers of different colors that accumulated on the shark's teeth over the years. In the 1950s, atomic bomb testing produced unusually large amounts of carbon-14, which fell from the atmosphere into the ocean and accumulated as a distinctive layer on the shark's teeth corresponding to a known period in time. Perplexingly, even though great white sharks live longer than had been expected, some parties maintain that based on the new findings, the great white sharks must be protected from overfishing.

Which of the following, if true, best resolves the discrepancy identified above?


Great white sharks need to be protected from overfishing because they are dying rapidly due to poisoning by carbon-14.

Great white sharks were determined to live longer than had been previously thought based on the discovery of a carbon-14-rich layer within older sharks' teeth.

Great white sharks are evidently endangered and therefore need to be protected from overfishing.

Some great white sharks may have rich layers of carbon-14 from other sources, depending on their migration patterns.

Great white sharks' longer lifespan implies that they mature more slowly and reproduce more slowly than had previously been assumed.


OA/OE after three postings


only E gives a valid reason to protect the sharks from overfishing.
A - not true. evidence of C14 on shark's teeth from 1950 - so not actually poisoning..
B - that is stated in the argument, and doesn't help to explain the paradox
C - evidently? how? very vague..so not good.
D - other sources of C14 is out of scope.
E - looks good.
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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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New post 12 Oct 2016, 02:52
Boiled down to C and E.

Evidently in C seemed too extreme. There is nothing in the stem that seems to point that evidently they are endangered.

Hence E.

My assumption was that - sharks need to be protected from overfishing because their fodder - (other fishes) - is getting depleted and hence they are dying since they are not getting any food to eat even though they can live longer than expected :D
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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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New post 05 Feb 2017, 15:41
Ans is E, but this part of the explanation posted by daagh sums it up well:

daagh wrote:
Explanation from GMAT FREE, the source

Creating a filter: "Perplexingly" is an important word, because it allows us to parse the prompt into two parts. The second, shorter part is that sharks must be protected from overfishing. Why is that perplexing? Because of whatever the main point of the first part is: sharks live longer than expected. We'll look for something that connects logically to both parts: 1) sharks live longer than expected, and 2) they must be protected.

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Re: Recently, scientists determined that great white sharks can live over  [#permalink]

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Re: Recently, scientists determined that great white sharks can live over &nbs [#permalink] 07 Sep 2018, 22:45
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