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Whales originated in the freshwater lakes and rivers of

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Whales originated in the freshwater lakes and rivers of [#permalink] New post 20 Dec 2008, 05:17
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A
B
C
D
E

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Whales originated in the freshwater lakes and rivers of ancient Asia about sixty
million years ago. Not until about ten million years later did species of whales
develop specialized kidneys enabling them to drink salt water. Although fossil
evidence shows that some early whale species that lacked such kidneys sometimes
swam in the Earth’s saltwater oceans, these species must have had to return frequently
to freshwater rivers to drink.
Which of the following is most strongly supported by the information given?
A. Fossils of whale species dating from between sixty million and fifty million
years ago will not be found on continents that were at the time separated from
ancient Asia by wide expanses of ocean.
B. Among whale fossils that date from later than about fifty million years ago,
none are fossils of whale species that drank only fresh water.
C. Fossils of whale species that drank fresh water will not be found in close
proximity to fossils of whale species that drank salt water.
D. The earliest whales that drank salt water differed from fresh-water-drinking
whales only in their possession of specialized kidneys.
E. Between sixty million and fifty million years ago, the freshwater lakes and
rivers in which whales originated were gradually invaded by salt water.
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Re: CR-Whales [#permalink] New post 20 Dec 2008, 08:39
IMO E

Whales developed specialised kidneys only from 50m yrs ago. So from 60m yrs ago to 50m yrs ago, there was a change which forced the whales to develop specialised kidneys (salt water mixing with fresh water).
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Re: CR-Whales [#permalink] New post 03 Jan 2009, 10:17
A for me ..
Vivek , OA pls !!
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Re: CR-Whales [#permalink] New post 03 Jan 2009, 14:26
rprabhu2001 wrote:
IMO E

Whales developed specialised kidneys only from 50m yrs ago. So from 60m yrs ago to 50m yrs ago, there was a change which forced the whales to develop specialised kidneys (salt water mixing with fresh water).


I think you make an unnecessary assumption here. does the change have to be gradual? maybe there was a sudden change and in 10 million years, whales have adapted themselves..

my answer would be A, even though i did not like it much. POE leads to A, however.
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Re: CR-Whales [#permalink] New post 03 Jan 2009, 21:06
vivektripathi wrote:
Whales originated in the freshwater lakes and rivers of ancient Asia about sixty
million years ago. Not until about ten million years later did species of whales
develop specialized kidneys enabling them to drink salt water. Although fossil
evidence shows that some early whale species that lacked such kidneys sometimes
swam in the Earth’s saltwater oceans, these species must have had to return frequently
to freshwater rivers to drink.
Which of the following is most strongly supported by the information given?
A. Fossils of whale species dating from between sixty million and fifty million
years ago will not be found on continents that were at the time separated from
ancient Asia by wide expanses of ocean.
B. Among whale fossils that date from later than about fifty million years ago,
none are fossils of whale species that drank only fresh water.
C. Fossils of whale species that drank fresh water will not be found in close
proximity to fossils of whale species that drank salt water.
D. The earliest whales that drank salt water differed from fresh-water-drinking
whales only in their possession of specialized kidneys.
E. Between sixty million and fifty million years ago, the freshwater lakes and
rivers in which whales originated were gradually invaded by salt water.


The conclusion should be based only on the specific information given in the text. The original text does not disscuss "the fossils themseves" or the comparsion btw fossils", A, B, C, out.

D: "the earliest whales", D out

E is the best
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Re: CR-Whales [#permalink] New post 26 Jan 2009, 10:12
IMO A

Whats the OA
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Re: CR-Whales [#permalink] New post 27 Jan 2009, 20:21
A........
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Re: CR-Whales [#permalink] New post 27 Jan 2009, 21:11
A. Im not excpecting OA from vivek
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Re: CR-Whales [#permalink] New post 27 Jan 2009, 22:35
ritula wrote:
Im not excpecting OA from vivek


WHY...???

BTW. I think the answer is A because, if the fossils were to be found on the continents separated from Asia by large ocean bodies then the claim that " whales might have had to return frequently to fresh water to drink" will be untrue.

Hence the statement in A has to be true...

Cheers,

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Re: CR-Whales [#permalink] New post 28 Jan 2009, 22:04
The correct answer is E. Nothing in the stimulus justifies A.
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Re: CR-Whales [#permalink] New post 29 Jan 2009, 13:47
ritula wrote:
A. Im not excpecting OA from vivek


:shock: yes, whay not? :shock: :shock:

IMO A

If at the beggining whales couldn't swim into salt water and they originated in Asia, fossils dating between sixty million and fifty million years will be discovered only close to Asia

OA and Source?

Thanks
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Re: CR-Whales [#permalink] New post 29 Jan 2009, 17:42
A is my choice also.

JohnLewis1980 wrote:
ritula wrote:
A. Im not excpecting OA from vivek


:shock: yes, whay not? :shock: :shock:

IMO A

If at the beggining whales couldn't swim into salt water and they originated in Asia, fossils dating between sixty million and fifty million years will be discovered only close to Asia

OA and Source?

Thanks

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Re: CR-Whales   [#permalink] 29 Jan 2009, 17:42
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