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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 13 Oct 2008, 20:31
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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: [#permalink] New post 14 Oct 2008, 01:13
IMO C
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Re: CR: [#permalink] New post 14 Oct 2008, 02:19
arorag 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. => this does not support !!in fact is quite irrelevant to the context,drinking salt water and kidneys are not related by this option !!!hence whether they swam not swam in oceans is given here hence OOS,in the argument its said that they swim in salt water hence this counters that evidence !!out

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. => this does not talk about kidneys !!!OUT

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.
=> this is irrelevant ,way too generic!!!

D. The earliest whales that drank salt water differed from fresh-water-drinking whales only in their possession of specialized kidneys.
=>THIS SOUNDS CORRECT since they diff in only spl kidneys ,those which didnot develop did not drink saline water

E. Between sixty million and fifty million years ago, the freshwater lakes and rivers in which whales originated were gradually invaded by salt water. => this is generic statement !! OUT

WHATS TEH OA
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Re: CR: [#permalink] New post 14 Oct 2008, 03:24
Another C.
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Re: CR: [#permalink] New post 14 Oct 2008, 03:40
A for me . I can explain if its the OA .
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Re: CR: [#permalink] New post 14 Oct 2008, 03:44
arorag 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.


I pick A.

Since the whales had to return to freshwater frequently to drink water, they could not have swam large distances in sea water.
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Re: CR: [#permalink] New post 14 Oct 2008, 03:50
I will go with C. whts the OA?
arorag 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.
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Re: CR: [#permalink] New post 14 Oct 2008, 05:23
A for me.

ritula wrote:
arorag wrote:
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.

if whales have to return frequently to fresh water, there is no chance that they can go to another continent.
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: [#permalink] New post 14 Oct 2008, 05:28
C
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Re: CR: [#permalink] New post 14 Oct 2008, 05:47
alpha_plus_gamma wrote:
A for me.

ritula wrote:
arorag wrote:
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.

if whales have to return frequently to fresh water, there is no chance that they can go to another continent.
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.


Dont u think theres a loophole in the answer !!!
The what if whales dont drink for days and days and just swim and go to the other continents !!!i dont think this particular option is strong enough !!!HEnce A cannot be the OA

C cannot be the OA since what if fresh water bodies and salty water bodies existed in close proximity then we can get the fossils together !!!!Also even if this were true !!then whats proved !!!does it say antyhing about kidneys !!!again even if they were far seperated what iff they were drinking in two far away parts o ocean!!!hence C is also not strong enough to support

Out of all the given options only D is a bit convincing !!!stating only diff between two types of whales is in their kidneys !!the hypothesis stated in argument becomes true since the premise says they lack spl kidneys hence they must drink fresh water !!!hence they must return !!!I hope i could clear my point !!!!

IMO D
whats the OA ????????????
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Re: CR: [#permalink] New post 14 Oct 2008, 06:08
http://gmatclub.com/forum/11-t54909?view=previous
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Re: CR: [#permalink] New post 14 Oct 2008, 06:16
If the whales originated in Asia 60 million years ago and they did not develop the ability to drink salt water until 50 million years ago, then they could not have crossed oceans which are salt water bodies, to go to distant continents. According to the passage, they needed to swim back to fresh waters to get a drink and this would not be possible if they were in the middle of an ocean.
Therefore, A seems logical.
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Re: CR: [#permalink] New post 14 Oct 2008, 06:22
KASSALMD wrote:
If the whales originated in Asia 60 million years ago and they did not develop the ability to drink salt water until 50 million years ago, then they could not have crossed oceans which are salt water bodies, to go to distant continents. According to the passage, they needed to swim back to fresh waters to get a drink and this would not be possible if they were in the middle of an ocean.
Therefore, A seems logical.


This is precisely the reason why A is right here. A is saying

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.

Look at the portions I have enlarged. One is from your post and one is the option A
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Re: CR: [#permalink] New post 14 Oct 2008, 06:26
I am not sure!
Whats the OA?
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Re: CR: [#permalink] New post 14 Oct 2008, 06:32
handikap wrote:
I am not sure!
Whats the OA?


follow this thread :) http://gmatclub.com/forum/11-t54909?view=previous
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Re: CR: [#permalink] New post 14 Oct 2008, 09:31
must be A :lol:
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Re: CR: [#permalink] New post 15 Oct 2008, 12:28
Wow, that's a lot of exclamation marks!!!
:computer
:wink:

spriya wrote:
Dont u think theres a loophole in the answer !!!
The what if whales dont drink for days and days and just swim and go to the other continents !!!i dont think this particular option is strong enough !!!HEnce A cannot be the OA

C cannot be the OA since what if fresh water bodies and salty water bodies existed in close proximity then we can get the fossils together !!!!Also even if this were true !!then whats proved !!!does it say antyhing about kidneys !!!again even if they were far seperated what iff they were drinking in two far away parts o ocean!!!hence C is also not strong enough to support

Out of all the given options only D is a bit convincing !!!stating only diff between two types of whales is in their kidneys !!the hypothesis stated in argument becomes true since the premise says they lack spl kidneys hence they must drink fresh water !!!hence they must return !!!I hope i could clear my point !!!!

IMO D
whats the OA ????????????
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Re: CR: [#permalink] New post 15 Oct 2008, 12:36
A should,IMO, BE THE ANSWER. iT IS LOGICAL THAT IF THE WHALES HAVE TO RETURN TO FRESHWATER EACH TIME THEY NEED A DRINK, HOW WILL THEY EVER CROSS THE OCEAN TO ANOTHER CONTINENT.
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Re: CR: [#permalink] New post 16 Oct 2008, 11:12
A
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Re: CR: [#permalink] New post 16 Oct 2008, 11:29
E for me
Re: CR:   [#permalink] 16 Oct 2008, 11:29
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