For the first time, an earth-like planet has been : GMAT Critical Reasoning (CR)
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# For the first time, an earth-like planet has been

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SVP
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For the first time, an earth-like planet has been [#permalink]

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10 Sep 2004, 07:21
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For the first time, an earth-like planet has been discovered. Since this planet is orbiting another star, the greatest chance for extraterrestrial life
to exist is outside our solar system.

The argument above assumes which of the following?

Extraterrestrial organisms are likely to appear in forms similar to terrestrial ones.

Life cannot exist on the other planets of our solar system.

Life will always occur wherever earth-like planets exist.

Life is most likely to arise under earth-like conditions.

Life from other kinds of planets is too difficult to detect.
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Director
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10 Sep 2004, 07:49
Was in balance between B and D.
I think end of the stem stress more answer B than D.
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10 Sep 2004, 10:16
D is my choice.
Conclusion: The planet represents the greatest chance outside our solar system for ET life to exist.
Evidence: It is an earth like planet.

The choice that best connects the conclusion and evidence is choice D.
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10 Sep 2004, 11:05
D must be it
Life could exist on Mars and there is no allusion to life potential in our solar system whatsoever
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Paul

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10 Sep 2004, 11:57
D, if there is a catch let us know!
S
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10 Sep 2004, 13:04
Paul wrote:
D must be it
Life could exist on Mars and there is no allusion to life potential in our solar system whatsoever

Yes
I chose D for similar reason
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10 Sep 2004, 13:10
I would choose B.

The greatest chance for extracadabra life is outside our solar system.

I could be wrong, but on the real test I would choose this one.

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Alex
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10 Sep 2004, 14:32
I will go with B.

Life cannot exist on planets of our solar system (Assumption).
Earth like planet discovered outside our solar system.
So, greatest chance to find life is outside our solar system.

Second best choice is D. D does not explain why life cannot be found on our solar system.
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10 Sep 2004, 16:31
I think it's between C and D. C is just a stronger version of D.

Like usual, we simplify:

(i) An earth-like planet is discovered.
(ii) The planet is in another solar system.
(iii) --------------------
(iv) Thus, greatest chance of extra terrestrial life is outside our solar system.

(iii) has to link the existence of life with an earth-like planet or conditions. The assumption, then, is: we discovered an earth-like planet and we have discovered life!

What if the planet is earth-like in conditions/appearance only and life has never been introduced there before?

(C) and (D) both say the same thing. You'll choose (C) over (D) because we're talking about a whole planet and not just conditions. You'll choose (D) over (C) because (C) talks in absolute terms ("always") while (D) tones it down and uses likelihoods.

If I was a GMAT testmaker, I wouldn't subject the students to the agony of this judgement call and change one thing in either of the choices to making it lacking in some respect.
10 Sep 2004, 16:31
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