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# Whales originated in the freshwater lakes and rivers of

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VP
Joined: 03 Apr 2007
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Whales originated in the freshwater lakes and rivers of [#permalink]

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09 Jul 2008, 22:21
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0% (00:00) correct 100% (04:47) wrong based on 3 sessions

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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

I picked D when I solved the CR . I kind of know why it is wrong. DO you want to give your reasons?

Last edited by goalsnr on 10 Jul 2008, 12:28, edited 1 time in total.
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Director
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09 Jul 2008, 23:10
A, can't swim across the ocean without straying from fresh water sources
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10 Jul 2008, 04:56
A for me as well
Senior Manager
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10 Jul 2008, 05:28
Yep one more A.
Director
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10 Jul 2008, 05:50
gmatnub wrote:
A, can't swim across the ocean without straying from fresh water sources

Agreed
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10 Jul 2008, 06:46
gixxer1000 wrote:
gmatnub wrote:
A, can't swim across the ocean without straying from fresh water sources

Agreed

Are you guys sure....What about continental drifts?? This assumption will be true if the geography of earth was static. The other thing is it talks about fossils from 50 million years ago...there would def be significant continental drifts to make this an assumption.
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10 Jul 2008, 07:17
Ashwin_Mohan wrote:
gixxer1000 wrote:
gmatnub wrote:
A, can't swim across the ocean without straying from fresh water sources

Agreed

Are you guys sure....What about continental drifts?? This assumption will be true if the geography of earth was static. The other thing is it talks about fossils from 50 million years ago...there would def be significant continental drifts to make this an assumption.

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.

Were talking about continents that were not connected to Asia 50-60 million years ago. If they weren't connected then, and the fish could swim away, how would the fossils get someplace else?
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10 Jul 2008, 07:29
Got ya..."at that time"....grrrrr
Re: CR -whales   [#permalink] 10 Jul 2008, 07:29
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