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# It is theoretically possible that bacteria developed on - Q1

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Manager
Joined: 17 Aug 2009
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16 Dec 2009, 06:13
A. It fails to establish whether bacteria actually developed on Mars---it doesn’t need to establish when it has been theoretically established
B. It fails to establish how likely it is that Martian bacteria were transported to Earth----it has already established it theoretically
C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth. -------------out of scope
D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria. ----------CORRECT. If this were true then the argument would fall apart. As then the sole bacteria currently present could have been originated in Mars. So no distinction is needed.
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.---it has already mentioned that they would have died out.
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19 Dec 2009, 19:23
+1 for D, what is the OA?
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20 Dec 2009, 18:29
D
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It is theoretically possible that bacteria developed on Mars [#permalink]

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21 Mar 2010, 12:31
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacteria strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.

The argument is most vulnerable to which of the following criticism:
A: It fails to establish whether bacteria actually developed on Mars
B: It fails to establish how likely it is that Martian bacteria were transported to Earth
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth
D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria
E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out

OA =
[Reveal] Spoiler:
D

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Re: Martian bacteria on Earth [#permalink]

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21 Mar 2010, 16:22
3
KUDOS
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. Premise However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacteria strains on Earth are different enough to have arisen on different planets. Counter -premise
So, even if bacteria did arrive on Earth from Mars, they must have died out. - conclusion

Weaken question - find the choice that weakens the conclusion

A: It fails to establish whether bacteria actually developed on Mars - no where related to conclusion ,also author says theoretically possible

B: It fails to establish how likely it is that Martian bacteria were transported to Earth no where related to conclusion ,also author says meteroite
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth -no where related to conclusion

D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria - correct ,if the bacteria on earth are arisen from mars bacteria that means mars bacteria did not die

E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out
-no where related to conclusion

In weaken questions - look for the answer choices that attack the conclusion
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Re: Martian bacteria on Earth [#permalink]

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22 Mar 2010, 00:46
thanks iccha, tough one!
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Re: Martian bacteria on Earth [#permalink]

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23 Mar 2010, 00:33
I think its D.

A: It fails to establish whether bacteria actually developed on Mars - irrelevant
B: It fails to establish how likely it is that Martian bacteria were transported to Earth - irrelevant
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth -it isn't necessary to know the mode of transport
D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria - if all the bacteria on Earth have been transported from Mars, then they haven't died out. Hence, correct !
E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out - irrelevant
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Re: Martian bacteria on Earth [#permalink]

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09 Oct 2010, 09:45
its D..
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Re: Martian bacteria on Earth [#permalink]

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24 Dec 2010, 16:20
D
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Re: Martian bacteria on Earth [#permalink]

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24 Dec 2010, 18:30
this was't so tought, D is obvious
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Re: Martian bacteria on Earth [#permalink]

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25 Dec 2010, 08:43
nifoui wrote:
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacteria strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.

The argument is most vulnerable to which of the following criticism:
A: It fails to establish whether bacteria actually developed on Mars
B: It fails to establish how likely it is that Martian bacteria were transported to Earth
C: It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth
D: It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria
E: It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out

OA =
[Reveal] Spoiler:
D

Answer is D IMO . Reason is that the argument is based on the assumption that bacteria existed on earth prior to the skirmish with meteorites carrying Martian bacteria stains. D significantly weakens the conclusion "even if bacteria did arrive on Earth from Mars, they must have died out" .
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06 Mar 2011, 01:38
why is e wrong? dont both options d and e imply the same thing?
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06 Mar 2011, 22:43
no, they dont. e says that there might have been some bacteria strains which originated in india and died out- but what is that to do with wheteher bacterias came from mars or not- it is actually irrelevant
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It is theoretically possible that bacteria developed on Mars [#permalink]

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29 Feb 2012, 15:14
Question 11: (W) It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out. The argument is most vulnerable to which of the following criticisms?
A. It fails to establish whether bacteria actually developed on Mars.
B. It fails to establish how likely it is that Martian bacteria were transported to Earth.
C. It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.
D. It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

Could someone help me with the answer in this one? Also please provide explanation.

thanks
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Re: It is theoretically possible that bacteria developed on Mars [#permalink]

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01 Mar 2012, 00:18
raviram80 wrote:
Question 11: (W) It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out. The argument is most vulnerable to which of the following criticisms?
E. It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

I will deeply explain only the correct choice because I'm seating at the office and do not have more time to do so.

First, the conclusion of the argument: If bacteria on Earth from Mars, they must died out.

The premise: Strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time

No two bacterial strains on Earth are different enough to have arisen on different planets.

If we insert choice E in side YES, the bacteria origin from Earth died out, then the bacteria from Mars develop. The conclusion is broken.

In side NO, reversely, the conclusion is secured.
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Re: It is theoretically possible that bacteria developed on Mars [#permalink]

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01 Mar 2012, 00:56
1
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I go with D.

the contention made by the author is that since all bacteria on earth are not different enough to have arisen from different planets, any bacteria that may have come from mars must have died out. D refutes this by suggesting the possibility that all the bacteria we see today could be from mars and that the bacteria that originated on earth could have died out. Hence D is correct

Problems with others:

A: Unrelated
B: Unrelated
C: Unrelated
E: Even if some strains of bacteria that originated on earth did die out, this does not preclude the martian strains from dying out leaving some strains that originated on Earth. Note that the statement does not say all bacteria that originated from Earth died out, like D does.. which is what we need.
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Re: It is theoretically possible that bacteria developed on Mars [#permalink]

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01 Mar 2012, 03:30
I will go for D for the same reasoning as karun0109 ...
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Re: It is theoretically possible that bacteria developed on - Q1 [#permalink]

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16 Jun 2013, 21:58
I picked E and realized why it's wrong. Who cares about strains of bacteria that originated on Earth? I picked this because I was thinking, oh well if the strains on earth died out, the bacteria that is from Mars MAY be comparable...but who cares? The conclusion is saying, so if bacteria DID come from Mars, it probably died out. D is the best choice because maybe the bacteria now IS from Mars...therefore it didn't die out (and we are assuming that the bacteria here is from Earth instead).
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Re: It is theoretically possible that bacteria developed on - Q1 [#permalink]

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16 Jun 2013, 23:53
still I have conusion with (d) and (e)

Could anyone explain why (d) is wrong
Regards
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Re: It is theoretically possible that bacteria developed on - Q1 [#permalink]

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18 Jun 2013, 01:31
Practicegmat wrote:
still I have conusion with (d) and (e)

Could anyone explain why (d) is wrong
Regards

Hi Practicegmat.

I think your question is wrong cause D is correct. Probably, your question is "why E is wrong?" if that's true, so this is my explanation.

Conclusion is: if bacteria did arrive on Earth from Mars, they must have died out because no two bacterial strains on Earth are different enough to have arisen on different planets.

What should we attack? We weaken the conclusion by showing that all bacteria on Earth now were transported to Earth from Mars and NOT died out later.

But (E) It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

E does not attack the conclusion at all. There would be the case that some bacteria originated on Earth died out later and bacteria transported from Mars to Earth also died out.

Hence E is incorrect.

Hope it helps.
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Re: It is theoretically possible that bacteria developed on - Q1   [#permalink] 18 Jun 2013, 01:31

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