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In our solar system only one of the nine

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In our solar system only one of the nine [#permalink] New post 13 Apr 2009, 08:29
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E

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In our solar system only one of the nine planets-Earth-qualifies as fit to sustain life. Nonetheless, using this ratio, and considering the astonishingly large number of planetary systems in the universe, we must conclude that the number of planets fit to sustain some form of life is extremely large.

The argument is questionable because it presumes which one of the following without providing justification?

(A) If a planet is Earthlike, then life will arise on it.
(B) our solar system is similar to many other planetary systems in the universe.
(C) The conditions necessary for life to begin are well understood.
(D) Life similar to Earth's could evolve under conditions very different from those on Earth.
(E) Most other planetary systems in the universe have nine planets.

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Re: CR : In our solar system [#permalink] New post 13 Apr 2009, 09:30
I'd guess B...? But what is the OA?

gmatavenue wrote:
In our solar system only one of the nine planets-Earth-qualifies as fit to sustain life. Nonetheless, using this ratio, and considering the astonishingly large number of planetary systems in the universe, we must conclude that the number of planets fit to sustain some form of life is extremely large.

The argument is questionable because it presumes which one of the following without providing justification?

(A) If a planet is Earthlike, then life will arise on it.
the conclusion never refers to the number of planets were life WILL arise, just the number of planets "fit to sustain some form of life"
(B) our solar system is similar to many other planetary systems in the universe.
i think this one is correct, since some other planetary systems in the universe could be completely different from ours and thus the assumption that the ratio of 1:8 for planets fit to sustain life versus planets not fit wouldn't be applicable
(C) The conditions necessary for life to begin are well understood.
random/out of scope
(D) Life similar to Earth's could evolve under conditions very different from those on Earth.
the argument uses the opposite of this assumption as its basis so this one doesn't hold.
(E) Most other planetary systems in the universe have nine planets.
the argument doesn't necessarily require that all or most other systems also have nine planets since it's just applying a ratio.

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Re: CR : In our solar system [#permalink] New post 13 Apr 2009, 21:08
(A) If a planet is Earthlike, then life will arise on it. – I think this is required in the statements as if the any other planet in other solar system is like earth then life may arise on it
(B) our solar system is similar to many other planetary systems in the universe. – similarity in solar system will not help but similarity in the conditions on earth will help.
(C) The conditions necessary for life to begin are well understood. – out of scope
(D) Life similar to Earth's could evolve under conditions very different from those on Earth. – we are not talking about different conditions
(E) Most other planetary systems in the universe have nine planets. – this will not help for the argument
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Re: CR : In our solar system [#permalink] New post 15 Apr 2009, 21:45
B for me
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Re: CR : In our solar system [#permalink] New post 15 Apr 2009, 22:10
A looks like a trap.
B for me.
not A because argument only talks about other planets being 'fit' for life and not whether life will actually arise on it.
OA?
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Re: CR : In our solar system [#permalink] New post 16 Apr 2009, 09:27
one more for B
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Re: CR : In our solar system [#permalink] New post 16 Apr 2009, 12:24
E for me.
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Re: CR : In our solar system [#permalink] New post 16 Apr 2009, 18:24
I got A at first, but then saw other responses, and realized it's B.
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Re: CR : In our solar system [#permalink] New post 19 Apr 2009, 01:41
OA is B . Thanks all.
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Re: CR : In our solar system [#permalink] New post 11 Jun 2009, 02:57
It's B.
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Re: CR : In our solar system [#permalink] New post 11 Jun 2009, 04:41
Surely B... based on the ratio in solar system, writer is making a conclusion for the whole universe. This means, he is assuming solar system and universe are very similar.
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Re: CR : In our solar system [#permalink] New post 11 Jun 2009, 05:12
I think B is the best answer. A is wrong because of the wording.
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Re: CR : In our solar system [#permalink] New post 11 Jun 2009, 10:47
its B.
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Re: CR : In our solar system [#permalink] New post 13 Jun 2009, 11:06
I think its B since the main comparison id between our solar system and other planetary systems.....
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Re: CR : In our solar system   [#permalink] 13 Jun 2009, 11:06
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In our solar system only one of the nine

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