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Sub 505 (Easy)|   Comparisons|   Parallelism|                           
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GMATNinja I am trying to establish the changed meaning when there is a by after comma versus when there is not (as in C). Please help me understand this nuance.

Thanks!
Without the by, (C) is open to another interpretation: maybe "tending, gathering, and building" are things that happen as a result of serving the colony -- those ants serve the colony, and in doing so, they are tending, gathering, and building. In other words, the tending, gathering, and building might be the result of the serving, not the mechanism by which they serve.

To make matters worse in (C), why is there a "by" before "battling" but not before "tending, gathering, and building"? This actually compounds the issue -- is there a "by" in front a "battling" only because "battling" is the only one that's a mechanism of the serving, while the others are results of the serving? The meaning is open to interpretation. (This is a great example of how flawed parallelism can affect the clarity of a sentence.)

In (E) we don't have that ambiguity. there is no question that "tending, gathering, and building" are things that those ants do to serve the colony. How do those ants serve the colony? By tending, gathering, and building.

I hope that helps!

GMATNinja
Why don't you need a comma before "and" in the correct answer? Isn't "the rest serve the colony by tending juveniles, gathering food, building the nest, or battling intruders" a complete sentence with a conjunction before it?
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GMATNinja I am trying to establish the changed meaning when there is a by after comma versus when there is not (as in C). Please help me understand this nuance.

Thanks!
Without the by, (C) is open to another interpretation: maybe "tending, gathering, and building" are things that happen as a result of serving the colony -- those ants serve the colony, and in doing so, they are tending, gathering, and building. In other words, the tending, gathering, and building might be the result of the serving, not the mechanism by which they serve.

To make matters worse in (C), why is there a "by" before "battling" but not before "tending, gathering, and building"? This actually compounds the issue -- is there a "by" in front a "battling" only because "battling" is the only one that's a mechanism of the serving, while the others are results of the serving? The meaning is open to interpretation. (This is a great example of how flawed parallelism can affect the clarity of a sentence.)

In (E) we don't have that ambiguity. there is no question that "tending, gathering, and building" are things that those ants do to serve the colony. How do those ants serve the colony? By tending, gathering, and building.

I hope that helps!

GMATNinja
Why don't you need a comma before "and" in the correct answer? Isn't "the rest serve the colony by tending juveniles, gathering food, building the nest, or battling intruders" a complete sentence with a conjunction before it?
Separating two independent clauses with a comma is a general convention, not a rule. (Though you do need the conjunction.) And here, both clauses are part of the "in which" modifier.

My guess is that the writer didn't use a comma because the modifying clauses are logically related. A few individuals do one thing. And the rest do another. Including a comma there might make it seem as though the second clause isn't part of the modifier or that the two clauses are logically independent, when they're clearly not.

Put another way, leaving out the comma makes the logic of the sentence clearer, and clearer is always better.

Most importantly, this part of the sentence isn't underlined! We can't change it, so it's not worth agonizing over.

I hope that helps!
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