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QOTD: Sixty-five million years ago, according to some scientists, an a

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Re: QOTD: Sixty-five million years ago, according to some scientists, an a  [#permalink]

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New post 04 Aug 2018, 01:46
daagh wrote:
Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.

A., which, causing plant and animal extinctions, marks --- 'Which' has no referent, present tense ' marks' is incorrect.

B., which caused the plant and animal extinctions marking -- same pronoun error as in A.

C. and causing plant and animal extinctions that mark --- a fragment

D. an event that caused plant and animal extinctions, and it marks -- no referent for the pronoun 'it'

E. an event that caused the plant and animal extinctions that mark -- correct choice. The restrictive pronoun 'that' before the plural verb 'mark' refers to the plural noun 'extinctions'.


daagh sir, why is the updated answer choice D incorrect?

Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.

(A) which, causing plant and animal extinctions, marks

(B) which caused the plant and animal extinctions and marks

(C) and causing plant and animal extinctions that mark
an asteriod causing extinctions is wrong here IMO (please correct me if I am wrong)

(D) an event that caused plant and animal extinctions, which marks
is there a SVA error in D (which refers to plant and animal extinctions? I thought which referred to event; but which probably refers to extinctions) please correct me if I am wrong
(E) an event that caused the plant and animal extinctions that mark
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Re: QOTD: Sixty-five million years ago, according to some scientists, an a  [#permalink]

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New post 04 Aug 2018, 12:53
Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.

(A) which, causing plant and animal extinctions, marks

(B) which caused the plant and animal extinctions and marks

(C) and causing plant and animal extinctions that mark

(D) an event that caused plant and animal extinctions, which marks

(E) an event that caused the plant and animal extinctions that mark

Which in A and B is referring to North America,wrong

C uses ing, wrong
D uses which marks, here ther is only one specific extictions possible and not many,thus which is not required.

E is correct.
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Re: QOTD: Sixty-five million years ago, according to some scientists, an a  [#permalink]

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New post 15 Aug 2018, 04:51
GMATNinja wrote:
Quote:
D. an event that caused plant and animal extinctions, and it marks

The last part of the underlined portion makes me hesitate: "it" could refer to "event", I guess. So "...an event that caused plant and animal extinctions, and the event marks the end of the geologic era..." That's not awful, but I really don't understand why we're starting a whole new clause there, with "event" as the subject. It makes a whole lot more sense when the end of the sentence says "... marks the end of the geologic era..." function as a modifier for "extinctions" -- and that's exactly what (E) does.

Since "it" is the subject of the second clause, you could also argue that it refers back to the subject of the first clause: "an asteroid bigger than Mount Everest." But that wouldn't really make much sense, either: the asteroid marks the end of the geologic era? Hm, not so sure about that one. But either way: even if you're OK with the pronoun, (E) does a much better job of conveying the meaning of the sentence.

Incidentally, there's another version of this answer choice in the verbal guide (any edition): "an event that caused plant and animal extinctions, which marks..." Clearly, that's wrong for a different reason: "extinctions... marks" is a clear subject-verb error.

Either way, (D) is gone.

Appreciate your crystle explanation, GMATNinja

Would you please elabrate further on choice D from author, which is a bit different from your quote D
Quote:
(D) an event that caused plant and animal extinctions, which marks

Honestly, i picked up D -- an event that caused plant and animal extinctions, which marks

Here is my reasoning,
I was struggling with which marks/mark the end of XXX, either "an event" or "extinctions", eventually, i chose "an event" because i thought it is somehow redundant to say extinctions mark the end.

another question, i am not 100% sure "which" refers to extinctions or an event.
at first glance, i view which refers to extincition, but later, i thougt it should refer to an event, because that caused plant and animal extinctions is modifier of an event, cataloging the event, if i removing the modifier, the core of the phrase is an event, so which refers to an event

Seems i am wrong, but i don't know where, genuinely want your help, mikemcgarry, GMATNinjaTwo, GMATNinja, MagooshExpert Carolyn,
sayantanc2
VeritasPrepKarishma
hope you guys join


Thanks in advance

have a lovely day.

>_~
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Re: QOTD: Sixty-five million years ago, according to some scientists, an a  [#permalink]

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New post 18 Aug 2018, 10:52
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souvik101990 wrote:

Verbal Question of The Day: Day 41: Sentence Correction


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Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.

(A) which, causing plant and animal extinctions, marks

(B) which caused the plant and animal extinctions and marks

(C) and causing plant and animal extinctions that mark

(D) an event that caused plant and animal extinctions, which marks

(E) an event that caused the plant and animal extinctions that mark

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SC SC4344 Verbal Review.jpg

https://www.nytimes.com/1996/11/26/science/asteroid-s-shallow-angle-may-have-sent-inferno-over-northern-kill-zone.html

SCIENTISTS have reconstructed an almost blow-by-blow account of the catastrophe that overtook the Earth 65 million years ago at the end of the age of dinosaurs.

They believe a marauding asteroid bigger than Mount Everest slammed into Earth at a shallow angle, blasting an inferno of white-hot debris for thousands of miles across the young continent of North America and turning its mountains and valleys into killing fields.

The incinerated plants and animals were the first victims in a wave of global extinction that eventually erased hundreds of thousands of species from the face of Earth, marking the end the Cretaceous Period.




Initially I chose D - an event that caused plant and animal extinctions, which marks (VR option).

However I realized that if the author wanted to describe the event marks the end of the geologic era, the sentence would be framed:

an event that caused plant and animal extinctions and that marks the end of the geologic era.

By placing that next to extinctions, the intended meaning is conveyed. - 1) Asteriod slams 2) Animals plants die so 1) does not mark the end of an era, the death of animals and plants is what finally marks the end of the said era. So that mark should modify the later sequence. (consequence)
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Re: QOTD: Sixty-five million years ago, according to some scientists, an a  [#permalink]

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New post 28 Aug 2018, 11:56
daagh wrote:
Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.

A., which, causing plant and animal extinctions, marks --- 'Which' has no referent, present tense ' marks' is incorrect.

B., which caused the plant and animal extinctions marking -- same pronoun error as in A.

C. and causing plant and animal extinctions that mark --- a fragment

D. an event that caused plant and animal extinctions, and it marks -- no referent for the pronoun 'it'

E. an event that caused the plant and animal extinctions that mark -- correct choice. The restrictive pronoun 'that' before the plural verb 'mark' refers to the plural noun 'extinctions'.


daagh I see no "it" in the question posted, maybe its edited now. Kindly explain how D is still wrong.
Thank you.
Re: QOTD: Sixty-five million years ago, according to some scientists, an a &nbs [#permalink] 28 Aug 2018, 11:56

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