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# Researchers blamed the low rate of growth in the harbor's toad populat

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Re: Researchers blamed the low rate of growth in the harbor's toad populat [#permalink]
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A is incorrect because the relative pronoun "which" attempts to modify the entire sentence preceding it.

On the GMAT, "which" can only modify a noun not a whole sentence. For example:

"It rained yesterday, which forced the school to cancel the sports event." is ungrammatical on the GMAT, because the relative pronoun "which" does not have a noun that it would modify.

A correct version could be:
"It rained yesterday, forcing the school to cancel the sports event."

Hope this helps!
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Re: Researchers blamed the low rate of growth in the harbor's toad populat [#permalink]
“Researchers blamed the low rate of growth in the harbor's toad population on lake toxicity as well as on the weather slowing metabolism and reproductive activity."

Is this sentence grammatically right? Let us see.
What is slowing metabolism and reproductive activity? Is it weather alone or lake toxicity as well? If you want to mean that both are responsible, then you have to necessarily put a comma after 'weather', so that the present participle ‘slowing’ modifies the entire noun idea before it. Otherwise, ‘slowing’ will be simply modifying weather alone and hence structurally and stylistically and semantically wrong. You can’t skip the comma before ‘slowing’
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Re: Researchers blamed the low rate of growth in the harbor's toad populat [#permalink]
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Researchers blamed the low rate of growth in the harbor's toad populat [#permalink]
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