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# Prehistoric chimpanzee species used tools similar to those used by pre

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Prehistoric chimpanzee species used tools similar to those used by pre  [#permalink]

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11 Dec 2010, 23:37
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35% (medium)

Question Stats:

68% (01:47) correct 32% (01:58) wrong based on 635 sessions

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Prehistoric chimpanzee species used tools similar to those used by prehistoric humans: prehistoric tools recently found in East Africa are of a type used by both species. The area where the tools were found, however, is a savanna, and whereas there were prehistoric humans who lived in savanna habitats, prehistoric chimpanzees lived only in forests. Therefore, the tools must have been used by humans rather than chimpanzees.

Which of the following is an assumption on which the argument depends?

(A) Prehistoric humans did not carry their tools with them when they traveled from one place to another.

(B) Since the evolution of the first primates, East Africa has been predominantly savanna.

(C) Prehistoric humans never ventured into areas of the forest that were inhabited by prehistoric chimpanzees.

(D) The area where the tools were found was not a forest at the time the tools were in use.

(E) The prehistoric ancestors of modern chimpanzees were not capable of using tools more sophisticated than those found recently in East Africa.

pls negate and explain your reasoning, if you just leave a answer choice with no explanation then it'll be useless to us.
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Joined: 14 Aug 2010
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Re: Prehistoric chimpanzee species used tools similar to those used by pre  [#permalink]

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12 Dec 2010, 00:20
1
gtr022001 wrote:
6. Prehistoric chimpanzee species used tools similar to those used by prehistoric humans: prehistoric tools recently found in East Africa are of a type used by both species. The area where the tools were found, however, is a savanna, and whereas there were prehistoric humans who lived in savanna habitats, prehistoric chimpanzees lived only in forests. Therefore, the tools must have been used by humans rather than chimpanzees.

Which of the following is an assumption on which the argument depends?

(A) Prehistoric humans did not carry their tools with them when they traveled from one place to another.

(B) Since the evolution of the first primates, East Africa has been predominantly savanna.

(C) Prehistoric humans never ventured into areas of the forest that were inhabited by prehistoric chimpanzees.

(D) The area where the tools were found was not a forest at the time the tools were in use.

(E) The prehistoric ancestors of modern chimpanzees were not capable of using tools more sophisticated than those found recently in East Africa.

pls negate and explain your reasoning, if you just leave a answer choice with no explanation then it'll be useless to us.

Premise 1:Prehistoric chimpanzee species used tools similar to those used by prehistoric humans

Premise 2:prehistoric tools recently found in East Africa are of a type used by both species. The area where the tools were found, however, is a savanna, and whereas there were prehistoric humans who lived in savanna habitats, prehistoric chimpanzees lived only in forests.

Conclusion: Therefore, the tools must have been used by humans rather than chimpanzees.

(A) Prehistoric humans did not carry their tools with them when they traveled from one place to another.
<Irrelevant>

(B) Since the evolution of the first primates, East Africa has been predominantly savanna.
<Doesn't affect the conclusion>

(C) Prehistoric humans never ventured into areas of the forest that were inhabited by prehistoric chimpanzees.
< Even if prehistoric humans once ventured in to forest , the conclusion is not affected>

(D) The area where the tools were found was not a forest at the time the tools were in use.
<if the area was a forest at the time tools were found ==> tools used by chimpanzees. Breaks the conclusion>

(E) The prehistoric ancestors of modern chimpanzees were not capable of using tools more sophisticated than those found recently in East Africa.
<irrelevant and doesn't affect the conclusion>
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Re: Prehistoric chimpanzee species used tools similar to those used by pre  [#permalink]

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10 Oct 2016, 06:50
D is correct. Here's why:

(A) Prehistoric humans did not carry their tools with them when they traveled from one place to another. --> we don't care

(B) Since the evolution of the first primates, East Africa has been predominantly savanna. --> not relevant

(C) Prehistoric humans never ventured into areas of the forest that were inhabited by prehistoric chimpanzees. --> not what we're looking for

(D) The area where the tools were found was not a forest at the time the tools were in use. --> cements that chimps were not in the picture; eliminates possibility for chimps and humans coexisting in the same area

(E) The prehistoric ancestors of modern chimpanzees were not capable of using tools more sophisticated than those found recently in East Africa. --> we don't care
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Re: Prehistoric chimpanzee species used tools similar to those used by pre  [#permalink]

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24 Oct 2016, 10:45
1
gtr022001 wrote:
6. Prehistoric chimpanzee species used tools similar to those used by prehistoric humans: prehistoric tools recently found in East Africa are of a type used by both species. The area where the tools were found, however, is a savanna, and whereas there were prehistoric humans who lived in savanna habitats, prehistoric chimpanzees lived only in forests. Therefore, the tools must have been used by humans rather than chimpanzees.

Which of the following is an assumption on which the argument depends?

(A) Prehistoric humans did not carry their tools with them when they traveled from one place to another.

(B) Since the evolution of the first primates, East Africa has been predominantly savanna.

(C) Prehistoric humans never ventured into areas of the forest that were inhabited by prehistoric chimpanzees.

(D) The area where the tools were found was not a forest at the time the tools were in use.

(E) The prehistoric ancestors of modern chimpanzees were not capable of using tools more sophisticated than those found recently in East Africa.

pls negate and explain your reasoning, if you just leave a answer choice with no explanation then it'll be useless to us.

Conclusion: The tools must have been used by humans rather than chimpanzees
Premise: The area where the tools were found, however, is a savanna, and whereas there were prehistoric humans who lived in savanna habitats, prehistoric chimpanzees lived only in forests.
Just think what can be the possible assumption
1) In the prehistoric times there was no forest in Savanna
2) Prehistoric Chimpanzees can never came to human habitat

Let's POE

(A) IncorrectPrehistoric humans did not carry their tools with them when they traveled from one place to another.
Evem if they carry tool from one place to another place. it will not help us in any way to link the premis to the conclusion

(B) IncorrectSince the evolution of the first primates, East Africa has been predominantly savanna.

No way this this statement is helping us

(C) IncorrectPrehistoric humans never ventured into areas of the forest that were inhabited by prehistoric chimpanzees.
Let's negate this answer option "Prehistoric humans sometimes ventured into areas of the forest that were inhabited by prehistoric chimpanzees.Here one can see negated option is not shattering the conclusion in any way.
(D)Correct The area where the tools were found was not a forest at the time the tools were in use.
Just negate this option "The area where the tools were found was a forest at the time the tools were in use."
On negation negated option tells us that yes tool could be used by Chimpanzee and this negated version shatters our conclusion.
(E) IncorrectThe prehistoric ancestors of modern chimpanzees were not capable of using tools more sophisticated than those found recently in East Africa.
Irreverent to the context given
Hence D is correct
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Re: Prehistoric chimpanzee species used tools similar to those used by pre  [#permalink]

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05 Sep 2018, 00:26
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Re: Prehistoric chimpanzee species used tools similar to those used by pre   [#permalink] 05 Sep 2018, 00:26
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