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# Genetic research suggests that after cheetah ancestors had migrated fr

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Re: Genetic research suggests that after cheetah ancestors had migrated fr  [#permalink]

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04 Nov 2018, 14:25
Just to confirm the past vs past perfect in C and B is not factor in decision, correct? It's the SV error that distinguishes right and wrong?
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Re: Genetic research suggests that after cheetah ancestors had migrated fr  [#permalink]

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05 Nov 2018, 23:41

is it okay to use comparative "lower " without "than "... why cant we use " are thought to have been LOW" ??

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Re: Genetic research suggests that after cheetah ancestors had migrated fr  [#permalink]

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05 Nov 2018, 23:50
GMATNinja All the options have a comma splice problem by having 2 independent clauses joint just by a comma right ?? Any thoughts...
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Re: Genetic research suggests that after cheetah ancestors had migrated fr  [#permalink]

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06 Nov 2018, 15:37
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is it okay to use comparative "lower " without "than "... why cant we use " are thought to have been LOW" ??

For this question, think of the sentence "I hope you feel better."

"Better" is the same part of speech as "lower" and it's implied that you're talking about "than you are now." So you don't always need a "than" in order to use an -er comparative adjective if there's a clear implied comparison point. Now I don't know that the GMAT would directly test that, but here where you don't get another way to say it - no answer choices give you a "than" option - I'd say it's fair game.

You could of course use "low" - if you said "when sea levels are thought to have been low" that works, too. Instead of an implied "lower than today" it would just mean "low" as compared to "high" but it's still valid.
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Re: Genetic research suggests that after cheetah ancestors had migrated fr  [#permalink]

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18 Mar 2019, 10:57
rahimk7 wrote:
ziyuen wrote:
Genetic research suggests that after cheetah ancestors had migrated from North America to Asia more than 100,000 years ago, when sea levels were thought to have been much lower, they quickly spread to Africa, where the species is safe from the ice ages that have wiped out its populations on other continents.

A. had migrated from North America to Asia more than 100,000 years ago, when sea levels were thought to have been much lower, they quickly spread to Africa, where the species is safe from the ice ages that have wiped out its

Use of had Migrated is wrong

B. migrated from North America to Asia more than 100,000 years ago, when sea levels are thought to have been much lower, they quickly spread to Africa, where the species was safe from the ice ages that wiped out its

Correct Choice

C. had migrated from North America to Asia more than 100,000 years ago, when sea levels are thought to have been much lower, they quickly spread to Africa, where the species was safe from the ice ages that wiped out their

Same as A

D. migrated from North America to Asia more than 100,000 years ago, when sea levels are thought to be much lower, they quickly spread to Africa, where the species has been safe from the ice ages that wiped out its

Has been safe - Wrong

E. migrated from North America to Asia more than 100,000 years ago, when sea levels were thought to have been much lower, they quickly spread to Africa, where the species is safe from the ice ages that wiped out their

Species is singular and hence singular verb.
Species is safe is present tense. Does not go with verb migrated in Past tense.

OFFICIAL SOLUTION

This problem offers a variety of decision points related to verb tenses and pronouns, and the key to solving it correctly lies in determining which decisions are fatally flawed - they provide an illogical, incorrect meaning - and which are more a matter of preference.

For example, the first major difference - "had migrated" vs. "migrated" - is really just a matter of preference. The past-perfect "had migrated" puts extra emphasis on the sequence of events, but the simple past "migrated" works just as well (think about it - saying "after I finished at the gym, I took a shower" works just as well as "after I had finished at the gym, I took a shower").

One completely illogical verb choice in this problem, however, is the "were thought to be" (or "were thought to have been") in choices A and E. The time period in question is more than 100,000 years ago, so "were" puts that "thought to be" in that timeframe. And clearly no one was thinking about sea level comparisons back then - that&#39;s current scientific analysis, so you must have "when sea levels are thought" with the "are" putting the thinking in the present.

Choice D commits a similar error: while the thinking "are thought to be" is in the proper, current tense, the verb "to be" there is incorrect. While the thinking is in the present tense, the lower water levels themselves were in the past, so a past-tense verb such as "are thought to have been" is required.

From there you might consider the pronoun decision between "its" and "their." The antecedent is "the species," requiring the singular "its" and helping you eliminate choice C.

Choice B uses logical verb tense and accurate pronouns throughout, and is therefore correct.

Sent from my iPhone using GMAT Club Forum mobile app

migrated is the earlier past activity after which they spread to africa, the later past activity.........use of past perfect is ok....

Re: Genetic research suggests that after cheetah ancestors had migrated fr   [#permalink] 18 Mar 2019, 10:57

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