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# The ability of mammals to control

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Manager
Joined: 30 Apr 2016
Posts: 61
Location: India
GMAT 1: 720 Q50 V38
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The ability of mammals to control  [#permalink]

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30 Apr 2017, 09:34
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Difficulty:

75% (hard)

Question Stats:

57% (01:43) correct 43% (01:49) wrong based on 253 sessions

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The ability of mammals to control their internal body temperatures is a factor in the development of their brains and intelligence.This can be seen from the following facts: the brain is a chemical machine, all chemical reactions are temperature dependent, and any organism that can control its body temperature can assure that these reactions occur at the proper temperatures. Which one of the following is an assumption on which the argument depends?

(A) Organisms unable to control their body temperatures do not have the capacity to generate internal body heat without relying on external factors.
(B) Mammals are the only animals that have the ability to control their internal body temperatures.
(C) The brain cannot support intelligence if the chemical reactions within it are subject to uncontrolled temperatures.
(D) The development of intelligence in mammals is not independent of the chemical reactions in their brains taking place at the proper temperatures.
(E) Organisms incapable of controlling their internal body temperatures are subject to unpredictable chemical processes.
Manager
Joined: 18 Jan 2017
Posts: 84
Location: India
Concentration: Finance, Economics
GMAT 1: 700 Q50 V34
Re: The ability of mammals to control  [#permalink]

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30 Apr 2017, 10:22
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The brain is a chemical machine, all chemical reactions are temperature dependent, and any organism that can control its body temperature can assure that these reactions occur at the proper temperatures.

The ability of mammals to control their internal body temperatures is a factor in the development of their brains and intelligence.

Assumption- The development of intelligence in mammals is not independent of the chemical reactions in their brains taking place at the proper temperatures.
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The ability of mammals to control  [#permalink]

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30 Apr 2017, 11:02
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The argument is saying Controlling body temperature and Development of brains and intelligence are linked with each other.

So, assumption is they are not happening independently.

That is what option D is doing.

(A) Organisms unable to control their body temperatures do not have the capacity to generate internal body heat without relying on external factors. : OFS. We are no where telling anything we need.
(B) Mammals are the only animals that have the ability to control their internal body temperatures. Extreme.
(C) The brain cannot support intelligence if the chemical reactions within it are subject to uncontrolled temperatures. : We know it supports at controlled temperatures but we are not sure what would otherwise. So, incorrect
(D) The development of intelligence in mammals is not independent of the chemical reactions in their brains taking place at the proper temperatures. Correct for the reasons stated above.
(E) Organisms incapable of controlling their internal body temperatures are subject to unpredictable chemical processes. : What would happen if they do not control is OFS.
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Director
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Re: The ability of mammals to control  [#permalink]

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30 Apr 2017, 18:46
D is my go. We must state that intelligence or development is dependent on chemical reactions.

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Re: The ability of mammals to control  [#permalink]

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28 May 2017, 22:51
Only negating option D tears up the argument apart. Hence it is the best choice.
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Joined: 12 Dec 2016
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Re: The ability of mammals to control  [#permalink]

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10 Dec 2017, 19:39
although this is a LSAT question, the pattern is very similar to that of a gmat question.
D is the answer b/c D fulfills the gap between "Development of intelligence" and "the brain"; also, C does not concern with "dependent"
The pattern in A,B,C,E is that the scope has shifted; in other words, the argument does not concern with what is not stated.
Re: The ability of mammals to control &nbs [#permalink] 10 Dec 2017, 19:39
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