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Investigation of the floor of the Black Sea, a saltwater sea connected

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Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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Investigation of the floor of the Black Sea, a saltwater sea connected with the Mediterranean Sea by a narrow channel and remote from other seas, has revealed deposits of freshwater shells dating from 5500 B.C. on an ancient shoreline. That shoreline lies 500 feet below the Black Sea'€™s current level, and the sediment just above it contains the remains only of saltwater creatures. Scientists hypothesize that about 5500 B.C., seawater from the Mediterranean overflowed into the Black Sea basin.

Which of the following would it be most useful to ascertain in order to evaluate the scientists' hypothesis?

A. Whether the body of freshwater whose shoreline was uncovered was less than 500 feet deep

B. Whether the remains of saltwater creatures contained in the layers of sediment that lie just above the ancient shoreline differ significantly from those contained in the topmost of layers of sediment in the floor of the Black Sea

C. Whether any of the freshwater shells show indication of having been used as tools

D. Whether there are traces of an ancient shoreline of the Black Sea that lies significantly less than 500 feet below the sea'€™s current level

E. Whether the remains of the saltwater creatures found in the sediment closely resemble the remains of Mediterranean saltwater creatures from the same period.

Noticed that this question was not there in our forum. Posting it for your benefit! :-D

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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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New post 24 Nov 2014, 06:34
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Premises:
The floor of the Black Sea has deposits only of FRESHWATER CREATURES, implying that -- at one time -- the Black Sea was composed of fresh water.
The sediment just above the floor contains the remains only of SALTWATER CREATURES, implying that -- at some point -- the Black Sea was transformed from a freshwater body to a saltwater body..

Conclusion: Seawater from the Mediterranean Sea overflowed into the Black Sea basin, transforming the Black Sea from a freshwater body to a saltwater body..

For evaluate CRs, rephrase the answer choices as STATEMENTS.
The rephrase of the correct answer choice will either STRENGTHEN or WEAKEN the conclusion.

Answer choice E, rephrased:
The remains of the saltwater creatures found in the sediment closely resemble the remains of Mediterranean saltwater creatures from the same period.
This rephrase establishes a link between MEDITERRANEAN SEA and the SALTWATER CREATURES whose remains have been found in the Black Sea, STRENGTHENING the conclusion that seawater from the Mediterranean Sea overflowed into the Black Sea basin.

The correct answer is E.
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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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Investigation of the floor of the Black Sea, a saltwater sea connected with the Mediterranean Sea by a narrow channel and remote from other seas, has revealed deposits of freshwater shells dating from 5500 B.C. on an ancient shoreline. That shoreline lies 500 feet below the Black Sea'€™s current level, and the sediment just above it contains the remains only of saltwater creatures. Scientists hypothesize that about 5500 B.C., seawater from the Mediterranean overflowed into the Black Sea basin.

Which of the following would it be most useful to ascertain in order to evaluate the scientists' hypothesis?

A. Whether the body of freshwater whose shoreline was uncovered was less than 500 feet deep - This is per premise that shoreline lies at 500 ft.

B. Whether the remains of saltwater creatures contained in the layers of sediment that lie just above the ancient shoreline differ significantly from those contained in the topmost of layers of sediment in the floor of the Black Sea - There is no mention of Mediterranean Sea sediments

C. Whether any of the freshwater shells show indication of having been used as tools - Completely OFS

D. Whether there are traces of an ancient shoreline of the Black Sea that lies significantly less than 500 feet below the sea'€™s current level
We need to know if there is any traces of Mediterranean sea in Black Sea sediments. It doesn't matter if the traces of shoreline is significantly less than 500 ft or at 500 ft.

E. Whether the remains of the saltwater creatures found in the sediment closely resemble the remains of Mediterranean saltwater creatures from the same period. - Correct - provides the required data to determine
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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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souvik101990 wrote:
For evaluate CRs, rephrase the answer choices as STATEMENTS.
The rephrase of the correct answer choice will either STRENGTHEN or WEAKEN the conclusion.


Answer choice E, rephrased:
The remains of the saltwater creatures found in the sediment closely resemble the remains of Mediterranean saltwater creatures from the same period.
This rephrase establishes a link between MEDITERRANEAN SEA and the SALTWATER CREATURES whose remains have been found in the Black Sea, STRENGTHENING the conclusion that seawater from the Mediterranean Sea overflowed into the Black Sea basin.


This strategy is amazing. :) I am bad in evaluate CR questions. Think this strategy will help me! Thanks souvik101990!

Glad I posted this Q here. :)

Great explanation by both of you as well! +1 :)
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Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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joseph0alexander wrote:
souvik101990 wrote:
For evaluate CRs, rephrase the answer choices as STATEMENTS.
The rephrase of the correct answer choice will either STRENGTHEN or WEAKEN the conclusion.


Answer choice E, rephrased:
The remains of the saltwater creatures found in the sediment closely resemble the remains of Mediterranean saltwater creatures from the same period.
This rephrase establishes a link between MEDITERRANEAN SEA and the SALTWATER CREATURES whose remains have been found in the Black Sea, STRENGTHENING the conclusion that seawater from the Mediterranean Sea overflowed into the Black Sea basin.


This strategy is amazing. :) I am bad in evaluate CR questions. Think this strategy will help me! Thanks souvik101990!

Glad I posted this Q here. :)

Great explanation by both of you as well! +1 :)


One of the strategies which I use and was taught by e-gmat class was the variance test.

Whatever question is asked in the option , answer as Yes and again answer as No, the conclusion will be different in two cases. Variance means there will be a variation of the conclusion.

For example, lets take the correct option E)
E) Whether the remains of the saltwater creatures found in the sediment closely resemble the remains of Mediterranean saltwater creatures from the same period.
lets say yes, there were remains -> Proves the hypothesis is correct.
Lets say No, there were no remains -> proves the hypothesis is incorrect.
So there is a variation of conclusion. Hence the correct answer.
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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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Copying other expert's explanation from other forum is not a good practice unless we mention the name of that expert.
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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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New post 31 Dec 2014, 22:09
Raihanuddin wrote:
Copying other expert's explanation from other forum is not a good practice unless we mention the name of that expert.


Majority of explanations are provided by me. Are you pointing to me?
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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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New post 31 Dec 2014, 22:15
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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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New post 02 Jan 2015, 02:03
The hypothesis that water from medeterrian flew to black sea would be more easily answered if we know any proof and option E presents one such proof like situation of whether the creature remains of the two seas bear any resemblance if answer is yes then yes water might have flown. This is the only choice asking about such possibility .Hence E is the answer.
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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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Phew.., took me 5 mins to answer the question, but got it right.

I wonder if there is a simpler or quicker way to answer questions of this kind. Questions such as this take a lot of time in the real GMAT. By the way what is the level of scoring for this question.

Thank you for posting such a nice question. A good brainer.


joseph0alexander wrote:
Investigation of the floor of the Black Sea, a saltwater sea connected with the Mediterranean Sea by a narrow channel and remote from other seas, has revealed deposits of freshwater shells dating from 5500 B.C. on an ancient shoreline. That shoreline lies 500 feet below the Black Sea'€™s current level, and the sediment just above it contains the remains only of saltwater creatures. Scientists hypothesize that about 5500 B.C., seawater from the Mediterranean overflowed into the Black Sea basin.

Which of the following would it be most useful to ascertain in order to evaluate the scientists' hypothesis?

A. Whether the body of freshwater whose shoreline was uncovered was less than 500 feet deep

B. Whether the remains of saltwater creatures contained in the layers of sediment that lie just above the ancient shoreline differ significantly from those contained in the topmost of layers of sediment in the floor of the Black Sea

C. Whether any of the freshwater shells show indication of having been used as tools

D. Whether there are traces of an ancient shoreline of the Black Sea that lies significantly less than 500 feet below the sea'€™s current level

E. Whether the remains of the saltwater creatures found in the sediment closely resemble the remains of Mediterranean saltwater creatures from the same period.

Noticed that this question was not there in our forum. Posting it for your benefit! :-D

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Re: Investigation of the floor of the Black Sea, a saltwater sea connected [#permalink]

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New post 19 Mar 2018, 09:42
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this question is hard b/c it is hard to catch the main idea of the argument, and how the option choices directly relate to the argument.

C and D are surely out of scope.
B and E are closed, but A also is a trap.
A is actually irrelevant b/c of "body of fresh water whose shorelines", B is not good enough and B is not so clear to be an assumption.
Re: Investigation of the floor of the Black Sea, a saltwater sea connected   [#permalink] 19 Mar 2018, 09:42
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