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# Peacocks with spectacular plumage are almost always free of parasites.

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Manager
Joined: 08 Sep 2017
Posts: 57
Peacocks with spectacular plumage are almost always free of parasites.  [#permalink]

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29 Jul 2018, 15:36
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25% (medium)

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79% (01:21) correct 21% (01:32) wrong based on 53 sessions

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Peacocks with spectacular plumage are almost always free of parasites. Additionally, evidence shows that the peacocks with parasitic infections are rarely capable of maintaining spectacular plumage. Therefore, it is reasonable to conclude that a brilliant display of feathers somehow provides a defense against parasites.

Which of the following, if true, most seriously calls the conclusion above into question?

A) Parasites cause peacocks to lose the ability to maintain spectacular plumage, rather than the other way around.
B) Peacocks that are free of parasites eat more, on average, than those with parasitic infections.
C) Other animals that are normally spectacularly colored tend to lose their color when infected by parasites.
D) Peacocks' plumage normally gets brighter as the birds get older, regardless of infection.
E) There is no hereditary difference between peacocks with spectacular plumage and those who have lost the ability to maintain spectacular plumage.

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Re: Peacocks with spectacular plumage are almost always free of parasites.  [#permalink]

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29 Jul 2018, 19:10
dimmak wrote:
Peacocks with spectacular plumage are almost always free of parasites. Additionally, evidence shows that the peacocks with parasitic infections are rarely capable of maintaining spectacular plumage. Therefore, it is reasonable to conclude that a brilliant display of feathers somehow provides a defense against parasites.

Which of the following, if true, most seriously calls the conclusion above into question?

A) Parasites cause peacocks to lose the ability to maintain spectacular plumage, rather than the other way around.
B) Peacocks that are free of parasites eat more, on average, than those with parasitic infections.
C) Other animals that are normally spectacularly colored tend to lose their color when infected by parasites.
D) Peacocks' plumage normally gets brighter as the birds get older, regardless of infection.
E) There is no hereditary difference between peacocks with spectacular plumage and those who have lost the ability to maintain spectacular plumage.

It is a typical case when the cause and the result stand not in their places.
Peacoks have a spectacular plumage (X) - not the cause.
Such peacoks free of parasites (Y) - not the result.
X ---> not Y
If we find a prove to it in the options we will find our answer.

A) Parasites cause peacocks to lose the ability to maintain spectacular plumage, rather than the other way around.
That is it.
Y ---> not X. It is the other way around.
So the nice plumage dose not defend the peackok
Math Expert
Joined: 02 Aug 2009
Posts: 6544
Re: Peacocks with spectacular plumage are almost always free of parasites.  [#permalink]

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29 Jul 2018, 19:37
dimmak wrote:
Peacocks with spectacular plumage are almost always free of parasites. Additionally, evidence shows that the peacocks with parasitic infections are rarely capable of maintaining spectacular plumage. Therefore, it is reasonable to conclude that a brilliant display of feathers somehow provides a defense against parasites.

Which of the following, if true, most seriously calls the conclusion above into question?

A) Parasites cause peacocks to lose the ability to maintain spectacular plumage, rather than the other way around.
B) Peacocks that are free of parasites eat more, on average, than those with parasitic infections.
C) Other animals that are normally spectacularly colored tend to lose their color when infected by parasites.
D) Peacocks' plumage normally gets brighter as the birds get older, regardless of infection.
E) There is no hereditary difference between peacocks with spectacular plumage and those who have lost the ability to maintain spectacular plumage.

When you have A and B together in a reasoning and B is attributed to A
Then we are asked to find a flaw or weaken the argument..

It is clear cut :-
WHY it can't be otherwise? That is why can't A be attributed to B

Choice A tells us that exactly

A
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

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Re: Peacocks with spectacular plumage are almost always free of parasites. &nbs [#permalink] 29 Jul 2018, 19:37
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