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The Aquipos toucan is able to use its long beak to reach inside

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The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 08 Aug 2015, 10:33
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A
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Question Stats:

61% (01:33) correct 39% (01:42) wrong based on 296 sessions

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The Aquipos toucan is able to use its long beak to reach inside apertures in a tree’s bark and feed on the insects that dwell within and that are the toucan’s main food source. Several noted ornithologists have speculated that because the toucan’s beak is curved in a manner similar to the openings in the bark, the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

Which of the following, if true, argues most strongly against the ornithologists’ speculation?

A) Not all trees in the Aquipos toucan’s environment house sufficient quantities of insects to satisfy the caloric needs of the toucan.
B) Subtle gradations in the beak’s of other species of birds have allowed them to better access resources in their respective environments.
C) Many insects crawl on the bark of the tree and a toucan can sometimes become satiated without having to access insects living beneath the bark.
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
E) The tree holes in which the Aquipos toucan is able to access insects have a characteristic shape that differs only very slightly from tree to tree.

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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 08 Aug 2015, 10:58
Harley1980 wrote:
The Aquipos toucan is able to use its long beak to reach inside apertures in a tree’s bark and feed on the insects that dwell within and that are the toucan’s main food source. Several noted ornithologists have speculated that because the toucan’s beak is curved in a manner similar to the openings in the bark, the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

Which of the following, if true, argues most strongly against the ornithologists’ speculation?

A) Not all trees in the Aquipos toucan’s environment house sufficient quantities of insects to satisfy the caloric needs of the toucan.
B) Subtle gradations in the beak’s of other species of birds have allowed them to better access resources in their respective environments.
C) Many insects crawl on the bark of the tree and a toucan can sometimes become satiated without having to access insects living beneath the bark.
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
E) The tree holes in which the Aquipos toucan is able to access insects have a characteristic shape that differs only very slightly from tree to tree.



Good question!!!

D is cleverly worded saying that it is actually the bird that makes the holes curved and it is not other way round- Holes in trunks did not cause the beaks to become curved.

I hope I am correct in my explanation.
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The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 08 Aug 2015, 11:09
samichange wrote:
Harley1980 wrote:
The Aquipos toucan is able to use its long beak to reach inside apertures in a tree’s bark and feed on the insects that dwell within and that are the toucan’s main food source. Several noted ornithologists have speculated that because the toucan’s beak is curved in a manner similar to the openings in the bark, the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

Which of the following, if true, argues most strongly against the ornithologists’ speculation?

A) Not all trees in the Aquipos toucan’s environment house sufficient quantities of insects to satisfy the caloric needs of the toucan.
B) Subtle gradations in the beak’s of other species of birds have allowed them to better access resources in their respective environments.
C) Many insects crawl on the bark of the tree and a toucan can sometimes become satiated without having to access insects living beneath the bark.
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
E) The tree holes in which the Aquipos toucan is able to access insects have a characteristic shape that differs only very slightly from tree to tree.



Good question!!!

D is cleverly worded saying that it is actually the bird that makes the holes curved and it is not other way round- Holes in trunks did not cause the beaks to become curved.

I hope I am correct in my explanation.


Hello samichange

I think that D says that these birds can break the bark and get access to the holes in such direct manner and argument didn't says that birds create holes.

Also if holes were created by these birds seeking for insects then why these birds made this holes?
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 08 Aug 2015, 11:25
Harley1980 wrote:
samichange wrote:
Harley1980 wrote:
The Aquipos toucan is able to use its long beak to reach inside apertures in a tree’s bark and feed on the insects that dwell within and that are the toucan’s main food source. Several noted ornithologists have speculated that because the toucan’s beak is curved in a manner similar to the openings in the bark, the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

Which of the following, if true, argues most strongly against the ornithologists’ speculation?

A) Not all trees in the Aquipos toucan’s environment house sufficient quantities of insects to satisfy the caloric needs of the toucan.
B) Subtle gradations in the beak’s of other species of birds have allowed them to better access resources in their respective environments.
C) Many insects crawl on the bark of the tree and a toucan can sometimes become satiated without having to access insects living beneath the bark.
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
E) The tree holes in which the Aquipos toucan is able to access insects have a characteristic shape that differs only very slightly from tree to tree.



Good question!!!

D is cleverly worded saying that it is actually the bird that makes the holes curved and it is not other way round- Holes in trunks did not cause the beaks to become curved.

I hope I am correct in my explanation.


Hello samichange

I think that D says that these birds can break the bark and get access to the holes in such direct manner and argument didn't says that birds create holes.

Also if holes were created by these birds seeking for insects then why these birds made this holes?



I think you might have misunderstood my reply!!!
I will repeat-

The argument concludes that the shape of the holes influenced ( CAUSED) the beaks to shape and assume the curve shape of the holes.

D says the opposite- It is the beaks that are curved and so the holes are curved.The curved beaks make curved holes.

So the causality is reversed and reverse causality is a weakener.
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 08 Aug 2015, 11:46
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samichange wrote:
Harley1980 wrote:
samichange wrote:
Good question!!!

D is cleverly worded saying that it is actually the bird that makes the holes curved and it is not other way round- Holes in trunks did not cause the beaks to become curved.

I hope I am correct in my explanation.


Hello samichange

I think that D says that these birds can break the bark and get access to the holes in such direct manner and argument didn't says that birds create holes.

Also if holes were created by these birds seeking for insects then why these birds made this holes?



I think you might have misunderstood my reply!!!
I will repeat-

The argument concludes that the shape of the holes influenced ( CAUSED) the beaks to shape and assume the curve shape of the holes.

D says the opposite- It is the beaks that are curved and so the holes are curved.The curved beaks make curved holes.

So the causality is reversed and reverse causality is a weakener.


I understand what you said but there is no reversed causality in variant D.
Curved beak didn't make curved holes. Holes were created by process of tree growing.

Variant D says that these birds have no needs to have a curved beak because they can easily break bark and get access to the insects in holes.
So conclusion that these birds get these curved beaks as a result of evolution to get insects is wrong because they can get insects without curved beaks.
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How to solve main idea questions without full understanding of RC.
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 09 Aug 2015, 01:48
Harley1980 wrote:
The Aquipos toucan is able to use its long beak to reach inside apertures in a tree’s bark and feed on the insects that dwell within and that are the toucan’s main food source. Several noted ornithologists have speculated that because the toucan’s beak is curved in a manner similar to the openings in the bark, the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

Which of the following, if true, argues most strongly against the ornithologists’ speculation?

A) Not all trees in the Aquipos toucan’s environment house sufficient quantities of insects to satisfy the caloric needs of the toucan.
B) Subtle gradations in the beak’s of other species of birds have allowed them to better access resources in their respective environments.
C) Many insects crawl on the bark of the tree and a toucan can sometimes become satiated without having to access insects living beneath the bark.
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
E) The tree holes in which the Aquipos toucan is able to access insects have a characteristic shape that differs only very slightly from tree to tree.



I saw the discussion until now and believe Only C can be the answer.
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 09 Aug 2015, 23:38
the key word in the answer choice 'C' and why it is not the best answer is "sometimes".
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 09 Aug 2015, 23:38
the key word in the answer choice 'C' and why it is not the best answer is "sometimes".
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 10 Aug 2015, 00:04
Harley1980 wrote:
The Aquipos toucan is able to use its long beak to reach inside apertures in a tree’s bark and feed on the insects that dwell within and that are the toucan’s main food source. Several noted ornithologists have speculated that because the toucan’s beak is curved in a manner similar to the openings in the bark, the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

Which of the following, if true, argues most strongly against the ornithologists’ speculation?

A) Not all trees in the Aquipos toucan’s environment house sufficient quantities of insects to satisfy the caloric needs of the toucan.
B) Subtle gradations in the beak’s of other species of birds have allowed them to better access resources in their respective environments.
C) Many insects crawl on the bark of the tree and a toucan can sometimes become satiated without having to access insects living beneath the bark.
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
E) The tree holes in which the Aquipos toucan is able to access insects have a characteristic shape that differs only very slightly from tree to tree.


I still don't understand the reasoning :(
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 10 Aug 2015, 01:36
anupamadw wrote:
Harley1980 wrote:
The Aquipos toucan is able to use its long beak to reach inside apertures in a tree’s bark and feed on the insects that dwell within and that are the toucan’s main food source. Several noted ornithologists have speculated that because the toucan’s beak is curved in a manner similar to the openings in the bark, the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

Which of the following, if true, argues most strongly against the ornithologists’ speculation?

A) Not all trees in the Aquipos toucan’s environment house sufficient quantities of insects to satisfy the caloric needs of the toucan.
B) Subtle gradations in the beak’s of other species of birds have allowed them to better access resources in their respective environments.
C) Many insects crawl on the bark of the tree and a toucan can sometimes become satiated without having to access insects living beneath the bark.
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
E) The tree holes in which the Aquipos toucan is able to access insects have a characteristic shape that differs only very slightly from tree to tree.


I still don't understand the reasoning :(


Hello anupamadw

Here is solution
1) finding conclusion:
the beak evolved so that the toucan can best take advantage of the insects lying deep inside.

2) prethinking how we can weaken it
we can weaken it if we show that toucan has no need in curved beak for getting insects lying deep inside because if he has no need than evolution of his beak has another reasons

3) search for answer
D) The Aquipos toucan is also able to use its beak to break bark, thereby accessing insects that dwell in the trunk.
This is what we think in step 2: toucan has no need in curved beak for getting insects lying deep inside so evolution happened due to another reasons.

If you write on which step you have misunderstanidng I will try to explain it more thoroughly
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 10 Aug 2015, 05:28
Hi guys,

I selected the answer option B but now i realise that the word "sometimes" turned out to be my undoing.
However,the correct answer should be option D.

The reasoning is as follows

Cause : The bark's openings are curved
Cause : Toucan feeds on the insects present inside the bark

Effect : The toucan's beaks have evolved and became curvy.

Now,to weaken this reasoning,we have to show that there is an another cause for this effect.

Option D does this.

It says that the toucan's beaks can also be used to break the bark to prey on the insects,proving that the bark's curvy adaptation cannot be attributed to the bark's curvy structure.There might be some other reason as well.
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Re: The Aquipos toucan is able to use its long beak to reach inside [#permalink]

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New post 14 Jan 2018, 06:16
"The Aquipos toucan is able to use its long beak to reach inside apertures" is the key word; thus C is out of scope. Such pattern in C is common in gmat, test takers must know this.
Re: The Aquipos toucan is able to use its long beak to reach inside   [#permalink] 14 Jan 2018, 06:16
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