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The word "only" in the stimulus indicates that B is the answer.
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Got confused between B and D and selected D, but agrees with B.
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Was down with B and D.. chose D.. 
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IMO B. Makes most sense.
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Between B and C. C is based on conclusion but has an extreme word reference 'any' B is based on premise but is subtle. B seems better choice.
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I go for B. Earth's life is supported due to proper tilt. Moon gives the proper tilt. Hence if the moon goes away the tilt would get distorted and life would not be supported anymore.
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C,D, and E have extreme language OR material outside the scope of the passage. (You can't derive any of the inferences from what is given in the passage).
Between A and B, A is talking about an example. If you use the +1 and -1 technique to see which has a higher chance of a correct answer. I would go with +1 for B because it directly relates to a planet in the passage. I would not give a -1 to either of the choices A or B.
This leaves me with B as the answer.
PS: I am having a tough time with MUST BE TRUE types of questions. Anyone have a better way to tackle MUST BE TRUE types? I am looking for stuff which is not there in Powerscore. Cheers!
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+ 1 B, nice question.
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+1 for B
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+1 B
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statement2: stable angle --> gravity of moon contra: no gravity of moon --> no stable angle statement3: no stable angle --> extreme climate [no life] combining: no gravity of moon --> no stable angle --> extreme climate [no life] this is exactly what B says.
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Last edited by MBAhereIcome on 15 Sep 2011, 14:20, edited 2 times in total.
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prinits wrote: The axis of Earth’s daily rotation is tilted with respect to the plane of its orbit at an angle of roughly 23 degrees. That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon. Without such a stable and moderate axis tilt, a planet’s climate is too extreme and unstable to support life. Mars, for example, has only very small moons, tilts at wildly fluctuating angles, and cannot support life.
If the statements above are true, which one of the following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon, Mars would be able to support life.
Only one of the negating factors is eliminated. There may be other factors, such as oxygen, water to support life. So, just having a large moon won't guarantee a life.
Analogy:
Getting a 720 on GMAT won't guarantee an admission to HBS. However, not having a 720 will guarantee a rejection.
(B) If Earth’s Moon were to leave Earth’s orbit, Earth’s climate would be unable to support life.
only by the gravitational influence of Earth’s large, nearby Moon etc... The word "ONLY" says it all.
(C) Any planet with a stable, moderate axis tilt can support life.
"can" is a bad word. This statement can't be ruled out summarily because it uses "can" and it may be possible in reality. Considering just the passage, however, we can't conclude such a thing.
(D) Gravitational influences other than moons have little or no effect on the magnitude of the tilt angle of either Earth’s or Mars’s axis.
Nothing of this is mentioned in the passage. The passage says that the moon is responsible to keep the tilt stable, but it is not a deciding factor for the degree of the tilt per se. Can't be inferred.
(E) No planet that has more than one moon can support life.
Who knows if the stability increases with number of moons around a planet. So, this may not be true. If the planet didn't have any moon, then I'd give it a thought. Out of scope because we are not given any correlation between supporting life and having more than one moon.
Ans: "B"
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prinits wrote: The axis of Earth’s daily rotation is tilted with respect to the plane of its orbit at an angle of roughly 23 degrees. That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon. Without such a stable and moderate axis tilt, a planet’s climate is too extreme and unstable to support life. Mars, for example, has only very small moons, tilts at wildly fluctuating angles, and cannot support life.
If the statements above are true, which one of the following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon, Mars would be able to support life.
(B) If Earth’s Moon were to leave Earth’s orbit, Earth’s climate would be unable to support life.
(C) Any planet with a stable, moderate axis tilt can support life.
(D) Gravitational influences other than moons have little or no effect on the magnitude of the tilt angle of either Earth’s or Mars’s axis.
(E) No planet that has more than one moon can support life. Option B talks about what happens when the moon leaves earth's orbit. Earth will become like Mars. So B.
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tarek99 wrote: prinits wrote: The axis of Earth’s daily rotation is tilted with respect to the plane of its orbit at an angle of roughly 23 degrees. That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon. Without such a stable and moderate axis tilt, a planet’s climate is too extreme and unstable to support life. Mars, for example, has only very small moons, tilts at wildly fluctuating angles, and cannot support life.
If the statements above are true, which one of the following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon, Mars would be able to support life.
(B) If Earth’s Moon were to leave Earth’s orbit, Earth’s climate would be unable to support life.
(C) Any planet with a stable, moderate axis tilt can support life.
(D) Gravitational influences other than moons have little or no effect on the magnitude of the tilt angle of either Earth’s or Mars’s axis.
(E) No planet that has more than one moon can support life. I pick option D. a) The argument talks about Earth, so Mars is irrelevant b) It is rather the gravitational influence of the moon that helps keep the angle of roughly 23 degrees. Even though it's true that Earth's climate will be unable to support life when the moon leaves, there's also no guarantee that Earth's climate will continue to support life if the moon is still around. Other factors such as global warming can eventually lead the climate to harm life even when the moon is still around. c) we don't know whether a stable, moderate axis on other planets can support life, but we do know at least that it is keeping life that already exists on earth. D) Correct. The argument says, "That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon." E) We only know about earth. A sample can not represent the whole population. What works for earth may not necessarily works for other planets. i kind of agree with Tarek as i had also picked D as answer....that is the assumption we are trying to find here....so i am confused.....
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Re: The axis of Earth s daily rotation is tilted with respect to [#permalink]
 02 Apr 2012, 20:28
B. Facts: stable angle is important 23* is important the moon helps stabilize the angle mars has widely tilting angles mars has small moons (assumption: cannot help stabilize) earth (main topic) is important -- anything about any other planets is not important "plane of its orbit" is important... shows that it is influenced by something other than "moon". moon is not the only factor. because of this, we can eliminate a, c, e. between B & D: look at "plane of its orbit"
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Re: The axis of Earth s daily rotation is tilted with respect to [#permalink]
22 Aug 2012, 09:26
why is D wrong is it because nothing is talked about the gravitational influence of moons of mars??? but that is explicit from the last statement..
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Re: The axis of Earth s daily rotation is tilted with respect to [#permalink]
02 Apr 2013, 05:35
I may be wrong..Nowhere it says that stable axis supports life..It says unstable axis doesnt supports life.
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Re: The axis of Earth s daily rotation is tilted with respect to [#permalink]
04 Apr 2013, 12:49
Key is that the statement is about EARTH - focus on it, Mars is an afterthougt
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Re: The axis of Earth s daily rotation is tilted with respect to [#permalink]
18 Apr 2013, 01:36
The axis of Earth’s daily rotation is tilted with respect to the plane of its orbit at an angle of roughly 23 degrees. That angle can be kept fairly stable only by the gravitational influence of Earth’s large, nearby Moon. Without such a stable and moderate axis tilt, a planet’s climate is too extreme and unstable to support life. Mars, for example, has only very small moons, tilts at wildly fluctuating angles, and cannot support life.
If the statements above are true, which one of the following must also be true on the basis of them?
(A) If Mars had a sufficiently large nearby moon, Mars would be able to support life. not sure
(B) If Earth’s Moon were to leave Earth’s orbit, Earth’s climate would be unable to support life. if moon leaves the orbit, the axis will change resulting in extreme climate, Hence life won't be supported
(C) Any planet with a stable, moderate axis tilt can support life. not conclusive
(D) Gravitational influences other than moons have little or no effect on the magnitude of the tilt angle of either Earth’s or Mars’s axis. large moons have the effect
(E) No planet that has more than one moon can support life. extreme
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Re: The axis of Earth s daily rotation is tilted with respect to
[#permalink]
18 Apr 2013, 01:36
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