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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,
meshtrap

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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, 19:28
D

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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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02 Aug 2010, 22:41
very nice argument
straight 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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09 May 2011, 08:31
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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, 11:54
Agree with D.
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CR notes
http://gmatclub.com/forum/massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142
http://gmatclub.com/forum/1001-ds-questions-file-106193.html#p832133
http://gmatclub.com/forum/gmat-prep-critical-reasoning-collection-106783.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html?hilit=chineseburned

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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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18 Oct 2011, 04:38
1+ for D

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

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07 Jul 2012, 13:17
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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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Last edited by dentobizz on 07 Nov 2013, 19:27, edited 3 times in total.

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Re: Wild cheetahs in the African grasslands.... [#permalink]

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

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

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

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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.
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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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Re: Wild cheetahs live in the African grasslands. Previous   [#permalink] 01 Sep 2012, 21:11

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