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# Q)The greatest chance for the existence of extraterrestrial

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Joined: 04 Jun 2007
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Q)The greatest chance for the existence of extraterrestrial [#permalink]

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06 Jun 2007, 07:01
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Q)The greatest chance for the existence of extraterrestrial life is on a planet beyond our solar system. The Milky Way galaxy alone contains 100 billion other suns, many of which could be accompanied by planets similar enough to Earth to make them suitable abodes of life.

The statement presupposes which of the following?

A. Living creatures on another planet would probably have the same appearance as those on Earth.

B. Life cannot exist on other planets in our solar system.

C. If the appropriate physical conditions exist, life is an inevitable consequence.

D. More than one of the suns in the galaxy is accompanied by an Earth-like planet.

E. It is likely that life on another planet would require conditions similar to those on Earth.

Hi,
The OA for this question is option "E", can anyone tel me why it should not be "B". And hence tell me the strategy to be used in these types of CR questions which asks for "presupposition"....

Cheers,
Hem
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06 Jun 2007, 07:14
The question is asking to identify an assumption the passage makes.

B. Does not make sense b/c the passage states "the greatest chance", which means that finding life outside inside our solar system is slim but not impossible... B contradicts this.

E is correct b/c of the "similar to Earth" comment. The author is assuming that if life was to exist on other planets, the conditions on that planet would need to be similar to the conditions on Earth.
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