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Wild cheetahs live in the African grasslands. Previous

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Wild cheetahs live in the African grasslands. Previous [#permalink]

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19 Jul 2010, 15:34
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Wild cheetahs live in the African grasslands. Previous estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small, and the current population barely meets the previous estimates. At present, however, there is not enough African grassland to support a wild cheetah population larger than the current population.
The statements above, if true, most strongly support which one of the following conclusions?
(A) Previous estimates of the size of the existing wild cheetah population were inaccurate.
(B) The cheetah’s natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population.
(C) The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster.
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands.
(E) In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade.
[Reveal] Spoiler: OA

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19 Jul 2010, 18:08
noboru wrote:
Wild cheetahs live in the African grasslands. Previous estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small, and the current population barely meets the previous estimates. At present, however, there is not enough African grassland to support a wild cheetah population larger than the current population.
The statements above, if true, most strongly support which one of the following conclusions?
(A) Previous estimates of the size of the existing wild cheetah population were inaccurate.
(B) The cheetah’s natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population.
(C) The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster.
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands.
(E) In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade.

Premise -1) Previous estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small
2) Current estimate of size is smaller than previous estimates.
3) If the current size grows, the african natural habitat would not be able to support it.

Now, we need to find the conclusion to these premises based on the info provided. Lets go over the options

A. Previous estimates of the size of the existing wild cheetah population were inaccurate. - This stmt does not serve as the conclusion to the above premises as we are talking about the current size of the wild cheetah population and their survival.
B. The cheetah’s natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population. Even though the passage suggests that the natural habitat may not be able to support an increase in the current population, it does not mean that the habitat is decreasing, that too at a faster rate than the wild cheetah population size.
C. The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster. The passage does mention natural disaster but nothing about pollution or hunting
D. In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands. If the previous size estimates were small enough to not escape a natural disaster, the current size would surely not survive - Correct answer
E. In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade. Out of scope.

Hope it helps,
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21 Jul 2010, 12:19
I did not pick the correct OA but I agree with D.

Lets say for example....

The estimates were that there should be a population of 20 wild cheetahs to survive a natural disaster.

The current population barely meets the estimates. Means the current population is no where close to 20 cheetahs....may be currently there are only 6 wild cheetahs as part of cheetah population.

That means in the short run the wild cheetah population will not be capable of surviving a natural disaster in the African grasslands.
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21 Jul 2010, 21:52

Argument:

They estimate that wild cheetah is abuot XX size to survive the natural disater.
Currently the size of WC is YY < XX.
Now, there is not enough grass to support the current YY Wild Cheetah.

A - No indication that the estimate is inaccurate

B - The rate of decreasing was not discussed

C - Hungting and pollution were not discussed - Out of scope

D - not enough food for YY => YY will still < XX => Wild cheetah will not survive natural disater -> CORRECT

E - Next decade and past decade were not discussed - Out of scope
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30 Jul 2010, 08:21
estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small

not enough African grassland to support a wild cheetah population larger than the current population. even more accurately reinforces this situatation

so D
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06 May 2011, 03:45
not so straight but still D . took 2:18 min and had to use POE to eliminate options . only D could stand hence D .
'Previous estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small' ,

can some body explain what was too small here and why such stupid language was used ?
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10 May 2011, 02:34
Close call between B and D.

The population required to survive the natural disaster is small here.As the grasslands are not enough to support a lager population the Cheetah's are bound to be extinct if a natural disaster happens in short term.
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17 Oct 2011, 14:30
My bad was thinking between C and D.......IMOD
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17 Oct 2011, 19:35
+1 for D.

Premise 1: "size of population ...too small.." => means that the requirements were already less than appropriate.
Premise 2: Current population = previous estimates
Premise 3: Population can't increase further as habitat is limited

Conclusion : If a disaster happens in near future, wild cheetahs will be extinct.

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Wild cheetahs live in the African grasslands. Previous [#permalink]

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Updated on: 07 Nov 2013, 19:27
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Wild cheetahs live in the African grasslands. Previous estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small, and the current population barely meets the previous estimates, At present, however, there is not enough African grassland to support a wild cheetah population larger than the current population.

The statements above, if true, most strongly support which one of the following conclusions?

(A) Previous estimates of the size of the existing wild cheetah population were inaccurate.
(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population.
(C) The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster.
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands.
(E) In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade.

Please comment your reasons while giving answer options. I will come back with OA once I get some correct reasoning flowing in.
Also, let me know which kind of question type this question is...
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Originally posted by joshnsit on 07 Jul 2012, 13:17.
Last edited by dentobizz on 07 Nov 2013, 19:27, edited 3 times in total.
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07 Jul 2012, 15:21
joshnsit wrote:
Wild cheetahs live in the African grasslands. Previous estimates of the size that the wild cheetah population must be in order for these animals to suwive a natural disaster in the African grasslands region were too small, and the current population barely meets the previous estimates, At present, however, there is not enough African grassland to support a wild cheetah population larger than the current population.
The statements above, if true, most strongly support which one of the following conclusions?
(A) Previous estimates of the size of the existing wild cheetah population were inaccurate.
(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population.
(C) The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster.
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands.
(E) In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade.

Please comment your reasons while giving answer options. I will come back with OA once I get some correct reasoning flowing in.
Also, let me know which kind of question type this question is...

A) The passage above states this, but there is nothing actually supporting such a conclusion.
B) Nothing is said above about whether the size of the natural habitat is changing.
C) Nothing is said regarding either pollution or hunting, and as such we cannot make any conclusions regarding how much of a threat they pose to the cheetah population.

D) Yep, this looks right. Not enough land to support more cheetahs + not enough cheetahs to survive a natural disaster = in the short run, if there is a natural disaster, the cheetahs aren't going to be able to make it through.
E) Once again, we do not have any information shown in the passage about the expected frequency of natural disasters.

D's the only answer that makes sense.
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30 Aug 2012, 07:17
Hello Don,
Can you please explain why did you choose D ? My answer is ''(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population'' which is true based on the evidence in the last line "However,there is not enough African grassland to support a wild cheetah population larger...".Please suggest where I am mistaken.
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30 Aug 2012, 08:45
I think option D is correct answer. Why option B is wrong because it is too specific , the argument never mentioned about the rate.
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31 Aug 2012, 04:48
arijitb1980 wrote:
Hello Don,
Can you please explain why did you choose D ? My answer is ''(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population'' which is true based on the evidence in the last line "However,there is not enough African grassland to support a wild cheetah population larger...".Please suggest where I am mistaken.
First of all, this is a "Find the conclusion" and not strengthen question. You should be able to derive conclusion given in the correct option from the premises.
If it is strengthen question, choice B is correct.

Now, let us look into B to derive conclusion. Rate is change(wrt time or other quantity) of quantity. B specifically talks about rate(change wrt time) of natural habitat(No) and rate(change wrt time) of cheetah population(Yes).
Do premises talk about rate(change) of cheetah population? Yes
Earlier : Previous estimates of the size that the wild cheetah population must be in order for these animals to suwive a natural disaster in the African grasslands region were too small. [Note that here it is population size which is small and not the grassland region. It is more of SC than CR here ]
After : and the current population barely meets the previous estimates
So the change of population is almost zero, so the rate of population change will be zero wrt time. and unknown wrt grassland region....

So B can not be concluded

Let us see what premises say:
Earlier: Previous estimates of population was so small that it would wipe out species if natural disaster would have come.
After : Population is more or less same now.
Conclusion: Since, population is same(and other factors same), population will be wiped out if natural disaster will come in today's date and circumstances. That is what is the relevance of phrase "In the short term" in choice D actually.
This is what D says.
HTH
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Re: Wild cheetahs live in the African grasslands. Previous [#permalink]

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01 Sep 2012, 21:11
I selected B

(A) Previous estimates of the size of the existing wild cheetah population were inaccurate. - Weakens the premise
(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population. - Correct
(C) The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster. - Premise doesn't mention pollution nor hunting.
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands. - short term is a red flag.
(E) In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade. - Irrelevant
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01 Sep 2012, 21:49
IMO D. We can not conclude what is written in B. Rate of decrease in natural habitat is not compared anywhere in passage.
As mentioned in D "in short term" correctly encapsulate the current situation of cheetah in African grassland.
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Re: Wild cheetahs live in the African grasslands. Previous [#permalink]

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20 Sep 2012, 15:41
joshnsit wrote:
arijitb1980 wrote:
Hello Don,
Can you please explain why did you choose D ? My answer is ''(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population'' which is true based on the evidence in the last line "However,there is not enough African grassland to support a wild cheetah population larger...".Please suggest where I am mistaken.
First of all, this is a "Find the conclusion" and not strengthen question. You should be able to derive conclusion given in the correct option from the premises.
If it is strengthen question, choice B is correct.

Now, let us look into B to derive conclusion. Rate is change(wrt time or other quantity) of quantity. B specifically talks about rate(change wrt time) of natural habitat(No) and rate(change wrt time) of cheetah population(Yes).
Do premises talk about rate(change) of cheetah population? Yes
Earlier : Previous estimates of the size that the wild cheetah population must be in order for these animals to suwive a natural disaster in the African grasslands region were too small. [Note that here it is population size which is small and not the grassland region. It is more of SC than CR here ]
After : and the current population barely meets the previous estimates
So the change of population is almost zero, so the rate of population change will be zero wrt time. and unknown wrt grassland region....

So B can not be concluded

Let us see what premises say:
Earlier: Previous estimates of population was so small that it would wipe out species if natural disaster would have come.
After : Population is more or less same now.
Conclusion: Since, population is same(and other factors same), population will be wiped out if natural disaster will come in today's date and circumstances. That is what is the relevance of phrase "In the short term" in choice D actually.
This is what D says.
HTH

Hi Mate

I chose the answer as A. Perhaps my comprehension is very poor. I would write my reasoning here:-

Previous estimate about the size of pop was small - To me it means that someone estimated that on an area of say 1000 acres, only 100 can survive a natural disaster, but actually it was quite a lot more, say 200 (ratio land:pop = 5:1). But now, the population has come down to below 100 say 50 (Cuz the current pop barely meets the previous estimates). But the grassland has also reduced and cannot support even 50. So, the land size must have come down to below 250 (less than the ratio 0f 5:1).
But does this mean that in future, any disaster will not be survived by the cheetahs? Wot if the pop of cheetahs decreases further? Then the land will take care..
So only the estimates were inaccurate. And yes, by my technique, I can also say that the land size has reduced faster than the pop (pop - came down 4 times, but land came down by more than 4 times)...So even B is right for me.

Please help me, I think my comprehension has some flaw which I need to correct. I have been making mistakes on all the 700+ level questions.
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20 Sep 2012, 19:24
talismaaniac wrote:
joshnsit wrote:
arijitb1980 wrote:
Hello Don,
Can you please explain why did you choose D ? My answer is ''(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population'' which is true based on the evidence in the last line "However,there is not enough African grassland to support a wild cheetah population larger...".Please suggest where I am mistaken.
First of all, this is a "Find the conclusion" and not strengthen question. You should be able to derive conclusion given in the correct option from the premises.
If it is strengthen question, choice B is correct.

Now, let us look into B to derive conclusion. Rate is change(wrt time or other quantity) of quantity. B specifically talks about rate(change wrt time) of natural habitat(No) and rate(change wrt time) of cheetah population(Yes).
Do premises talk about rate(change) of cheetah population? Yes
Earlier : Previous estimates of the size that the wild cheetah population must be in order for these animals to suwive a natural disaster in the African grasslands region were too small. [Note that here it is population size which is small and not the grassland region. It is more of SC than CR here ]
After : and the current population barely meets the previous estimates
So the change of population is almost zero, so the rate of population change will be zero wrt time. and unknown wrt grassland region....

So B can not be concluded

Let us see what premises say:
Earlier: Previous estimates of population was so small that it would wipe out species if natural disaster would have come.
After : Population is more or less same now.
Conclusion: Since, population is same(and other factors same), population will be wiped out if natural disaster will come in today's date and circumstances. That is what is the relevance of phrase "In the short term" in choice D actually.
This is what D says.
HTH
Hi Mate
I chose the answer as A. Perhaps my comprehension is very poor. I would write my reasoning here:-
Previous estimate about the size of pop was small - To me it means that someone estimated that on an area of say 1000 acres, only 100 can survive a natural disaster, but actually it was quite a lot more, say 200 (ratio land:pop = 5:1). But now, the population has come down to below 100 say 50 (Cuz the current pop barely meets the previous estimates). But the grassland has also reduced and cannot support even 50. So, the land size must have come down to below 250 (less than the ratio 0f 5:1).
But does this mean that in future, any disaster will not be survived by the cheetahs? Wot if the pop of cheetahs decreases further? Then the land will take care..
So only the estimates were inaccurate. And yes, by my technique, I can also say that the land size has reduced faster than the pop (pop - came down 4 times, but land came down by more than 4 times)...So even B is right for me.

Please help me, I think my comprehension has some flaw which I need to correct. I have been making mistakes on all the 700+ level questions.
@talismaaniac, Let's pull the straws of this problem one by one.
Statement 1: Wild cheetahs live in the African grasslands.
Statement 2: Previous estimates of the size(say 100 cheetahs as you said)that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small, ==> This statement has a conditional[If {unhighlighted part}, then {highlighted part}], which says that if the cheetahs have to survive a natural disaster in the grasslands, then number of 100 cheetahs is too small . But, nowhere it is told that without natural disaster, cheetahs will not survive. So, in one possibility that natural disaster doesnt come, cheetahs will survive.
Statement 3: the current population barely meets the previous estimates. => The currently population may be 99 or 100 cheetahs if it barely meets previous estimates, which was 100 cheetahs as per our first assumption.
Statement 4:At present, however, there is not enough African grassland to support a wild cheetah population larger than the current population.==> This statement says that size of grassland says that it will support 100 cheetahs but not 101 cheetahs, because it will not support any thing larger than current population(100 cheetahs)

Let us take what can be concluded from above statements:
(A) Previous estimates of the size of the existing wild cheetah population were inaccurate.-- Our initial estimate of 100 cheetahs is still valid. So, wrong statement.
(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population. -- The size of cheetah's natural habitat has bearing on cheetah's survival in a very specific case that a natural disaster occur. If that happens, cheetah's population will be zero. But, this option doesnt cover other option in which natural disaster doesn't happen as per statement 2. Moreover, statement 4 can mean that current grassland can support 100 cheetahs. So, this statement is not true in every case, so cant be a conclusion.
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands. -- In short term, the grassland area and the population cant be altered phenomenally (This is in accordance to various economic theories ). This answer statement is actually a rephrase of conditional in statement 2.
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If you know what you're worth, then go out and get what you're worth. But you gotta be willing to take the hits, and not pointing fingers saying you ain't where you wanna be because of anybody! Cowards do that and You're better than that!
The path is long, but self-surrender makes it short; the way is difficult, but perfect trust makes it easy.

Fire the final bullet only when you are constantly hitting the Bull's eye, till then KEEP PRACTICING.
Failure establishes only this, that our determination to succeed was not strong enough.
Getting defeated is just a temporary notion, giving it up is what makes it permanent.

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20 Sep 2012, 20:51
+1 D

(A) Previous estimates of the size of the existing wild cheetah population were inaccurate. (There is no mention of error in the previous estimate, eliminate)
(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population. (Again, natural habitat is already less and not decreasing, eliminate)
(C) The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster. (It is a comprehension which signifies natural disaster, we do not know about other dangers, out of scope, eliminate)
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands. (This can be concluded from the premise, since the grassland is not enough to support more cheetahs and the existing number of cheetahs are too small to overcome a natural disaster, thus our answer)
(E) In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade. (Out of scope, new information, eliminate)

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25 Sep 2012, 00:37
Wild cheetahs live in the African grasslands. Previous estimates of the size that the wild cheetah population must be in order for these animals to survive a natural disaster in the African grasslands region were too small, and the current population barely meets the previous estimates, At present, however, there is not enough African grassland to support a wild cheetah population larger than the current population.
The statements above, if true, most strongly support which one of the following conclusions?
(A) Previous estimates of the size of the existing wild cheetah population were inaccurate.
(B) The cheetah's natural habitat is decreasing in size at a faster rate than is the size of the wild cheetah population.
(C) The principal threat to the endangered wild cheetah population is neither pollution nor hunting, but a natural disaster.
(D) In the short term, the wild cheetah population will be incapable of surviving a natural disaster in the African grasslands.
(E) In regions where land is suitable for cheetah habitation, more natural disasters are expected to occur during the next decade than occurred during the past decade.

(A) Out of scope, we are only told that previous estimates of critical mass were too low.
(B) This is not mentioned in the passage at all! It may sound good if there was a real world behind this problem but you must take the information at face value and not let the real world cloud your judgement. Furthermore if you look at the argument this is not the correct conclusion

-previous est at critical mass was too low
-cheetah pop hasnt grown.
Therefore....likely that cheetah pop is actually below critical mass - so incapable of survival.

I skipped and went straight to D here, C and E are both out of scope
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