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17 Oct 2020, 07:49
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KavyaGanta
Take another look at (C):
Quote:
The passage states that stars form from a parent cloud of gas and that the cloud of gas “has a unique homogeneous chemical composition.” However, it does not state that the cloud’s chemical composition is passed on to the star. It’s possible that the chemical composition of the star is the result of complex chemical reactions or any other process. We simply don’t know that the star’s chemical composition is derived from it’s parent.
(C), however, tells us that the chemical composition of a star is indeed inherited from its parent cloud of gas. If this is the case, we have all the more reason to believe that two stars with the same chemical composition must have originated from the same cloud of gas. This is because we know that no two parent clouds have the same chemical composition (they are “unique”), and thus the stars’ chemical composition must have been inherited from the same parent cloud. For that reason, (C) is correct.
I hope that helps!
24 Apr 2021, 15:20
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2. Astronomer: Most stars are born in groups of thousands, each star in a group forming from the same parent cloud of gas. Each cloud has a unique homogeneous chemical composition. Therefore whenever two stars have the same chemical composition as each other, they must have originated from the same cloud of gas.
Conclusion - Therefore whenever two stars have the same chemical composition as each other, they must have originated from the same cloud of gas.
Which of the following, if true, would most strengthen the astronomer's argument?
(A) In some groups of stars, not every star originated from the same parent cloud of gas. this weakens the argument
(B) Clouds of gas of similar or identical chemical composition may be remote from each other.Being remote has no effect on the argument
(C) Whenever a star forms, it inherits the chemical composition of its parent cloud of gas.This strengthens the argument by saying that a star inherits parent cloud of gas
(D) Many stars in vastly different parts of the universe are quite similar in their chemical compositions.does not mention how they got their chemical composition
(E) Astronomers can at least sometimes precisely determine whether a star has the same chemical composition as its parent cloud of gas.who cares what the astronomers do?
Conclusion - Therefore whenever two stars have the same chemical composition as each other, they must have originated from the same cloud of gas.
Which of the following, if true, would most strengthen the astronomer's argument?
(A) In some groups of stars, not every star originated from the same parent cloud of gas. this weakens the argument
(B) Clouds of gas of similar or identical chemical composition may be remote from each other.Being remote has no effect on the argument
(C) Whenever a star forms, it inherits the chemical composition of its parent cloud of gas.This strengthens the argument by saying that a star inherits parent cloud of gas
(D) Many stars in vastly different parts of the universe are quite similar in their chemical compositions.does not mention how they got their chemical composition
(E) Astronomers can at least sometimes precisely determine whether a star has the same chemical composition as its parent cloud of gas.who cares what the astronomers do?
10 Oct 2025, 02:33
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Analysis: This prompt seems fair enough. Each gas cloud has a UNIQUE, one of a kind signature, so it follows that any two stars must have come from the same parent cloud, but WAIT! Just because stars may have come from the same parent cloud, does that necessarily mean that the stars would reflect that truth? Not necessarily. That is the HUGE missing gap in the logic of this argument. No question, the right option needs to fill that void that the stars reflect the chemical makeup of the parent gas cloud.
C) Yes! This was the exact missing link that we needed. The one piece of information that this argument lacks is that the stars take on an identifiable chemical signature from the parent cloud. C gives us exactly that. With C, we far more safely say that since the parent cloud has a UNIQUE chemical composition, AND with C, stars take take on that same chemical composition, that if two stars have the same composition as each-other, then they originated from the same cloud.
Answer: C
C) Yes! This was the exact missing link that we needed. The one piece of information that this argument lacks is that the stars take on an identifiable chemical signature from the parent cloud. C gives us exactly that. With C, we far more safely say that since the parent cloud has a UNIQUE chemical composition, AND with C, stars take take on that same chemical composition, that if two stars have the same composition as each-other, then they originated from the same cloud.
Answer: C
