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IMO E ; like the mammoths in an earlier period is correct as it is providing with additional information about the disappearance of mammoths which happened in an earlier period ,


SajjadAhmad
Scientists now suspect that imperial mammoths of the Pleistoscene period were wiped out not by human predation, as were mammoths of earlier periods, but by a sudden and extreme change in climate.

a) as were mammoths of earlier periods

b) like that in an earlier period

c) as in earlier period

d) as were earlier period

e) like the mammoths in an earlier period.
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mykrasovski
This is a tricky comparison problem.

generis, can you help with this problem please?
GMATNinja I feel that both A and E are correct. What do you think?
mykrasovski , you are right. This question is tricky. Good question. +1
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mykrasovski
This is a tricky comparison problem.

generis, can you help with this problem please?
GMATNinja I feel that both A and E are correct. What do you think?
mykrasovski , you are right. This question is tricky. Good question. +1


Thank you generis. After reading your explanation with an example I am quite convinced that A is the best option.
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This is a comparison question to understand the difference in the usage between 'like' and 'as'. Former is used for comparing nouns and latter is for comparing verbs. Here we are comparing the wiping of imperial mammoths, an action, hence A.
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SajjadAhmad
Scientists now suspect that imperial mammoths of the Pleistoscene period were wiped out not by human predation, as were mammoths of earlier periods, but by a sudden and extreme change in climate.

A) as were mammoths of earlier periods

B) like that in an earlier period

C) as in earlier periods

D) as were earlier periods

E) like the mammoths in an earlier period


Dear MartyTargetTestPrep

Can you please share you thoughts about choice A & E? It would be helpful.

Thanks in advance
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SajjadAhmad
Scientists now suspect that imperial mammoths of the Pleistoscene period were wiped out not by human predation, as were mammoths of earlier periods, but by a sudden and extreme change in climate.

A) as were mammoths of earlier periods

B) like that in an earlier period

C) as in earlier periods

D) as were earlier periods

E) like the mammoths in an earlier period

Dear MartyTargetTestPrep

Can you please share you thoughts about choice A & E? It would be helpful.

Thanks in advance
Here's the version created via the use of (A)

    Scientists now suspect that imperial mammoths of the Pleistoscene period were wiped out not by human predation, as were mammoths of earlier periods, but by a sudden and extreme change in climate.

It actually a little off, as "were wiped out not by human predation" does not quite work logically with "as were mammoths of earlier periods."

In fact, that version conveys the illogical meaning that the imperial mammoths were wiped out not by human predation as the mammoth of earlier periods were not wiped out by human predation.

One way to fix the sentence is to have the modifier that follows "human predation" modify "human predation," as in:

    "were wiped out not by human predation, the cause of the wiping out of mammoths of earlier periods."


Alternatively, if we reorder the words a little, the logic might work better.

    "were not wiped out by human predation, as were mammoths of earlier periods."

Hmm. Now it could be interpreted as conveying that the imperial mammoths were not wiped out by human predation as the mammoths of earlier periods were not wiped out by human predation.

I guess maybe it works, though it's not ideal.

Anyway, part of the reason why this question is giving people trouble is that version created via the use of the OA is not logical, though it becomes a little better if we reorder the words a bit.

Now, to have an apples to apples comparison, let's use the wording from (E) with the reordered version.

    "were not wiped out by human predation, like the mammoths in an earlier period"


Still not great. This version could be interpreted as saying "imperial mammoths were not x, like the mammoths of an earlier period, or it could be interpreted as conveying that neither set of mammoths we wiped out by human predation.z

Maybe if we delete the comma it works.

    "were not wiped out by human predation like the mammoths in an earlier period"

OK, without the comma, it's better.

What about the other version without the comma?

    "were not wiped out by human predation as were mammoths of earlier periods"

Still seems open to interpretation.

The only version that really works is the version in blue above.

Busted question. End of story.
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Here's the version created via the use of (A)

    Scientists now suspect that imperial mammoths of the Pleistoscene period were wiped out not by human predation, as were mammoths of earlier periods, but by a sudden and extreme change in climate.

It actually a little off, as "were wiped out not by human predation" does not quite work logically with "as were mammoths of earlier periods."

In fact, that version conveys the illogical meaning that the imperial mammoths were wiped out not by human predation as the mammoth of earlier periods were not wiped out by human predation.

One way to fix the sentence is to have the modifier that follows "human predation" modify "human predation," as in:

    "were wiped out not by human predation, the cause of the wiping out of mammoths of earlier periods."


Alternatively, if we reorder the words a little, the logic might work better.

    "were not wiped out by human predation, as were mammoths of earlier periods."

Hmm. Now it could be interpreted as conveying that the imperial mammoths were not wiped out by human predation as the mammoths of earlier periods were not wiped out by human predation.

I guess maybe it works, though it's not ideal.

Anyway, part of the reason why this question is giving people trouble is that version created via the use of the OA is not logical, though it becomes a little better if we reorder the words a bit.

Now, to have an apples to apples comparison, let's use the wording from (E) with the reordered version.

    "were not wiped out by human predation, like the mammoths in an earlier period"


Still not great. This version could be interpreted as saying "imperial mammoths were not x, like the mammoths of an earlier period, or it could be interpreted as conveying that neither set of mammoths we wiped out by human predation.z

Maybe if we delete the comma it works.

    "were not wiped out by human predation like the mammoths in an earlier period"

OK, without the comma, it's better.

What about the other version without the comma?

    "were not wiped out by human predation as were mammoths of earlier periods"

Still seems open to interpretation.

The only version that really works is the version in blue above.

Busted question. End of story.

Thanks a lot MartyTargetTestPrep. Have happy 4th July :)
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Scientists now suspect that imperial mammoths of the Pleistoscene period were wiped out not by human predation, as were mammoths of earlier periods, but by a sudden and extreme change in climate.

A was a bit off but i had interpreted it to be correct because between A and E, the contender, A was a clearer link between what was being compared.
B -"that" is ambiguous. Like that "human predation"? Like isn't correct in its use here either.
C suggests the same mammals were also wiped out in an earlier period.
D suggests that "earlier periods" themselves were wiped out
E is an incomplete comparison. Missing the verb to compare. Also not comparing the same thing. Comparing the source of wiping out to the mammoths themselves.
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SajjadAhmad
Scientists now suspect that imperial mammoths of the Pleistoscene period were wiped out not by human predation, as were mammoths of earlier periods, but by a sudden and extreme change in climate.

A) as were mammoths of earlier periods

B) like that in an earlier period

C) as in earlier periods

D) as were earlier periods

E) like the mammoths in an earlier period

this is not from official source, but it is good.
first point
when make comparison and ellipsis, check 3 things.
cut off phrase must be correct
tense of cut off phrase must be correct
the negative or positive kind of cut off phrase must be correct.

gmat can make one of 3 things above wrong and confuse us, who normally focus on cut off phrase.
choice B
"that in " is wrong. wrong cut off phrase
choice D
"as were earlier period". wrong cut off phrase.
choice C
"as in earlier period" means "as memothe of Pleolteset were wiped out in earlier period". this absurd. I said it many times and now I say it again. if you see the second clause of comparison contain only preposition phrase, the full whole preceding clause including its tense and mood "negative or affirmative sentence", is cut off. this make many chances for errors.

now, choice A and E
"as" is used two say two actions are done in the same way
"like" is used to say two nouns do the same action.
they are different in meaning but gmat never test us this difference because it is impossible to do so.
we do not worry about above difference here.

why choice E is wrong.
remember to keep tense and mood of whole preceding clause when make full the second clause.
E means
"like memoth of early period which were wipe out NOT by human predation". the "NOT" is kept in the second clause and make absurdity. E is gone.
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