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Human skin gives off an array of gaseous substances, including carbon

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Human skin gives off an array of gaseous substances, including carbon  [#permalink]

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New post Updated on: 16 Jul 2018, 22:32
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Question Stats:

44% (01:36) correct 56% (01:44) wrong based on 135 sessions

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Human skin gives off an array of gaseous substances, including carbon dioxide and lactic acid, both of which attract mosquitoes. However, neither of these two substances, whether alone or combined with one another, will attract mosquitoes as much as a bare human arm will, even in complete darkness, where a mosquito has no visual cues. Therefore, some other gaseous substance given off by human skin also attracts mosquitoes.

The reasoning in the argument requires which one of the following assumptions?

(A) Mosquitoes do not communicate with one another.
(B) Mosquitoes are not attracted to humans by body heat.
(C) Human skin gives off gaseous substances in greater amounts during the day than during the night.
(D) Mosquitoes are no more successful in finding a bare human arm in darkness than in light.
(E) Human skin never gives off any gaseous substances that repel mosquitoes.

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Originally posted by LeoGT on 16 Jul 2018, 22:24.
Last edited by Bunuel on 16 Jul 2018, 22:32, edited 1 time in total.
Renamed the topic and edited the question.
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Re: Human skin gives off an array of gaseous substances, including carbon  [#permalink]

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New post 16 Jul 2018, 23:29
1

Premise

Human skin gives off gaseous substances, two of which attract mosquitos. However, neither substance attracts mosquitoes as much as a bare human arm does.

Conclusion

Some gaseous substance, given off by the human skin, other the two mentioned also attracts mosquitoes.

Assumption

Helps bridge the gap between the conclusion and premise in the context of the information provided.

LeoGT wrote:
Human skin gives off an array of gaseous substances, including carbon dioxide and lactic acid, both of which attract mosquitoes. However, neither of these two substances, whether alone or combined with one another, will attract mosquitoes as much as a bare human arm will, even in complete darkness, where a mosquito has no visual cues. Therefore, some other gaseous substance given off by human skin also attracts mosquitoes.

The reasoning in the argument requires which one of the following assumptions?

(A) Mosquitoes do not communicate with one another.
Since we can't fit in this answer choice as a valid assumption, this is incorrect.
(B) Mosquitoes are not attracted to humans by body heat.
This answer choice makes sure there is no other cause of attraction for the mosquito towards a human. Therefore gaseous substance may be the only reason. Sufficient to bridge the gap between the conclusion and premise.
(C) Human skin gives off gaseous substances in greater amounts during the day than during the night.
Had amounts been greater during the night, both parts [skin and arm] would attract equally well during the day. Which is something the conclusion is not concerned with.
(D) Mosquitoes are no more successful in finding a bare human arm in darkness than in light.
Does not bridge the gap between the conclusion and the premise. Can't be a valid assumption.
(E) Human skin never gives off any gaseous substances that repel mosquitoes.
Mosquitoes which are repelled by the human skin are out of context. There may be some, (we don't know) question takes into account only those mosquitoes which are attracted to humans - bare hand or skin.


Correct Answer:B


I'm open to criticism, let me know if my reasoning is flawed.

If this helped, how about sending some Kudos my way? :-)
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Re: Human skin gives off an array of gaseous substances, including carbon  [#permalink]

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New post 17 Jul 2018, 06:48
abhinav770 wrote:

Premise

Human skin gives off gaseous substances, two of which attract mosquitos. However, neither substance attracts mosquitoes as much as a bare human arm does.

Conclusion

Some gaseous substance, given off by the human skin, other the two mentioned also attracts mosquitoes.

Assumption

Helps bridge the gap between the conclusion and premise in the context of the information provided.

LeoGT wrote:
Human skin gives off an array of gaseous substances, including carbon dioxide and lactic acid, both of which attract mosquitoes. However, neither of these two substances, whether alone or combined with one another, will attract mosquitoes as much as a bare human arm will, even in complete darkness, where a mosquito has no visual cues. Therefore, some other gaseous substance given off by human skin also attracts mosquitoes.

The reasoning in the argument requires which one of the following assumptions?

(A) Mosquitoes do not communicate with one another.
Since we can't fit in this answer choice as a valid assumption, this is incorrect.
(B) Mosquitoes are not attracted to humans by body heat.
This answer choice makes sure there is no other cause of attraction for the mosquito towards a human. Therefore gaseous substance may be the only reason. Sufficient to bridge the gap between the conclusion and premise.
(C) Human skin gives off gaseous substances in greater amounts during the day than during the night.
Had amounts been greater during the night, both parts [skin and arm] would attract equally well during the day. Which is something the conclusion is not concerned with.
(D) Mosquitoes are no more successful in finding a bare human arm in darkness than in light.
Does not bridge the gap between the conclusion and the premise. Can't be a valid assumption.
(E) Human skin never gives off any gaseous substances that repel mosquitoes.
Mosquitoes which are repelled by the human skin are out of context. There may be some, (we don't know) question takes into account only those mosquitoes which are attracted to humans - bare hand or skin.


Correct Answer:B


I'm open to criticism, let me know if my reasoning is flawed.

If this helped, how about sending some Kudos my way? :-)
Since body heat is not mentioned ..how come option B.

Sent from my SM-J700F using GMAT Club Forum mobile app
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Re: Human skin gives off an array of gaseous substances, including carbon  [#permalink]

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New post 17 Jul 2018, 07:06
Assumption negation technique:
Negate the contender and see whether the argument is sustained or collapsed.

Negate B ...
Mosquitoes are attracted to humans by body heat.

So except gaseous substances, body heat is also cause of attracting mosquito.
Therefore, B is correct answer.
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Re: Human skin gives off an array of gaseous substances, including carbon  [#permalink]

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New post 17 Jul 2018, 07:25
Hey vineethk929! Thanks for the query.

If answer choice (B) is correct, then a mosquito bite is not dependent on body heat, hence the only other factor behind mosquito's attraction toward human skin or arm must be gaseous substances given off from the body. To conclude the conclusion mentioned below, this was a fact assumed to be true. Although this information is not mentioned in the passage it sufficiently fills the gap between the conclusion and the premise. Hence it should be the correct answer.

Cheers! :-)

vineethk929 wrote:
abhinav770 wrote:

Premise

Human skin gives off gaseous substances, two of which attract mosquitos. However, neither substance attracts mosquitoes as much as a bare human arm does.

Conclusion

Some gaseous substance, given off by the human skin, other the two mentioned also attracts mosquitoes.

Assumption

Helps bridge the gap between the conclusion and premise in the context of the information provided.

LeoGT wrote:
Human skin gives off an array of gaseous substances, including carbon dioxide and lactic acid, both of which attract mosquitoes. However, neither of these two substances, whether alone or combined with one another, will attract mosquitoes as much as a bare human arm will, even in complete darkness, where a mosquito has no visual cues. Therefore, some other gaseous substance given off by human skin also attracts mosquitoes.

The reasoning in the argument requires which one of the following assumptions?

(A) Mosquitoes do not communicate with one another.
Since we can't fit in this answer choice as a valid assumption, this is incorrect.
(B) Mosquitoes are not attracted to humans by body heat.
This answer choice makes sure there is no other cause of attraction for the mosquito towards a human. Therefore gaseous substance may be the only reason. Sufficient to bridge the gap between the conclusion and premise.
(C) Human skin gives off gaseous substances in greater amounts during the day than during the night.
Had amounts been greater during the night, both parts [skin and arm] would attract equally well during the day. Which is something the conclusion is not concerned with.
(D) Mosquitoes are no more successful in finding a bare human arm in darkness than in light.
Does not bridge the gap between the conclusion and the premise. Can't be a valid assumption.
(E) Human skin never gives off any gaseous substances that repel mosquitoes.
Mosquitoes which are repelled by the human skin are out of context. There may be some, (we don't know) question takes into account only those mosquitoes which are attracted to humans - bare hand or skin.


Correct Answer:B


I'm open to criticism, let me know if my reasoning is flawed.

If this helped, how about sending some Kudos my way? :-)
Since body heat is not mentioned ..how come option B.

Sent from my SM-J700F using GMAT Club Forum mobile app

_________________

Stuck in the 600-700 score bracket? I welcome you to read my four-step course of action to a modest score.
I also invite you to critique and help me find flaws in my modus operandi. Thanks!

GMAT Club Bot
Re: Human skin gives off an array of gaseous substances, including carbon &nbs [#permalink] 17 Jul 2018, 07:25
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Human skin gives off an array of gaseous substances, including carbon

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