modern-day whales

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vikram4689: Legendary Member; Posts: 1325; Joined: Sun Nov 01, 2009 6:24 amFollowed by: 14 members; Thanked: 105 times

by vikram4689 » Sat Aug 18, 2012 8:30 pm

Fossil records reveal that modern-day whales had evolved from a land-dwelling ancestor that was forced into the water when its habitat sunk at the end of the Pleistocene period.

(A) had evolved from a land-dwelling ancestor that was forced into the water when its habitat sunk at the end of the Pleistocene period

(B) had evolved from a land-dwelling ancestor that has been forced into the water by the end of the Pleistocene period when their habitat sunk

(C) evolved from a land-dwelling ancestor that had been forced into the water at the end of the Pleistocene period with the sinking of its habitat

(D) evolved from a land-dwelling ancestor that was forced into the water when its habitat sunk at the end of the Pleistocene period

(E) evolved from a land-dwelling ancestor that, at the end of the Pleistocene period, was forced into the water when their habitat had sunk

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Source: Beat The GMAT — Sentence Correction | Sat Aug 18, 2012 8:30 pm

karthikgmat: Master | Next Rank: 500 Posts; Posts: 172; Joined: Wed Jul 09, 2008 3:35 amFollowed by: 1 member; Thanked: 3 times; GMAT Score:610

by karthikgmat » Sat Aug 18, 2012 8:49 pm

IMO D. Tense is correct in D.

E has error "their habitat"

C - error "with the sinking "

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vikram4689: Legendary Member; Posts: 1325; Joined: Sun Nov 01, 2009 6:24 amFollowed by: 14 members; Thanked: 105 times

by vikram4689 » Sat Aug 18, 2012 10:23 pm

D says "evolving" and "forcing" into water happened at same time. do you think sentence intends that meaning

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hjafferi: Senior | Next Rank: 100 Posts; Posts: 83; Joined: Sun Aug 19, 2012 12:42 am

by hjafferi » Sun Aug 19, 2012 8:26 am

My choice is also D as I think that evolve...forced and ....when...sink is correct structure.

Though I would appreciate it if an expert can provide more clarity...

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dasa: Newbie | Next Rank: 10 Posts; Posts: 2; Joined: Sun Dec 18, 2011 4:59 am

by dasa » Sun Aug 19, 2012 9:04 am

I think A and B is out as it is using "had evolved" , there are no two past occurrence happened.
Same way we can out C , E seems wordy and awkward

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shweta.kalra: Senior | Next Rank: 100 Posts; Posts: 38; Joined: Sun Jul 25, 2010 4:02 am

by shweta.kalra » Sun Aug 19, 2012 7:46 pm

hi.
expert please comment on :A:. why is this wrong? we have two past event evolved and forced.
thanks

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Sartaj: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Sat Aug 06, 2011 7:21 pm

by Sartaj » Sun Aug 19, 2012 10:09 pm

Let me try!

I read somewhere that if two events occur, GMAT preffers the usage of HAD for the event that occured in the distant past.

However, this sentence has some complex angles. Let me explain.

1) "That":

"That" is used to connect two clauses. In this sentence it connects "Fossil records reveal that modern-day whales had evolved from a land-dwelling ancestor" and "was forced into the water when its habitat sunk at the end of the Pleistocene period."

Since these are two separate clauses that have been merely connected by "that", we can put both the sentences in "simple past tense." There's no connection between the two clauses except the use of "that". Evolution of whales is an event that has nothing to do with what happened to its distant ancestors (gramatically, not scientifically). Hence, the use of "had" is unwarranted.

2) This brings me to my next point. Look at the second part of the sentence:

"that was forced into the water when its habitat sunk at the end of the Pleistocene period."

Now, "Forced into water" is one event, and "its habitat sunk" is another event. Does this mean that we should use "had"? NO. WHY? Because the sentence uses "when".

"When" is used to indicate two simultaneous events. The two events occured almost simultaneously. We do not prefer "had" in such cases.

THUS, we can reject A, B and C because they use "had" unnecessarily. (I hope this helps shweta.kalra)
The use of "their" in E is unwarranted.

My answer: D

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