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# Two centuries ago, Tufe Peninsula became separated form the mainland,

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Joined: 17 Aug 2016
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Re: Two centuries ago, Tufe Peninsula became separated form the mainland,  [#permalink]

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19 Sep 2017, 07:50
jet1445 wrote:
Q40:
Two centuries ago, Tufe Peninsula became separated form the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers. This population’s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland. Tufe Island is significantly drier than Tufe Peninsula was. So the current average height of Tufe’s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe’s environmental conditions.

Which of the following is an assumption on which the argument depends?

A. There are no types of vegetation on Tufe Island that are known to benefit from dry conditions.
B. There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today.
C. The mainland’s environment has not changed in ways that have resulted in Turfil sunflowers on the mainland growing to be 40 centimeters taller than they did two centuries ago.
D. The soil on Tufe Island, unlike that on the mainland, lacks important nutrients that help Turfil sunflowers survive and grow tall in a dry environment.
E. The 40-centimeter height difference between the Turfil sunflowers on Tufe Island and those on the mainland is the only difference between the two populations.

I got the answer wrong. Here is my understanding of this question -

There are two parts - Tufe Island(TI) and Tufe Mainland(TM)

Premise : TI sunflowers are on an average 40cm shorter than the TM sunflowers. And TI is drier than TM.

Conclusion: Current average height of Tufe’s(TI) Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe’s environmental conditions.

A. There are no types of vegetation on Tufe Island that are known to benefit from dry conditions. [ we are not interested what is happening to other vegetations - Out of Scope]
B. There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today. [ The number of SF is not important to us, their height is]
C. The mainland’s environment has not changed in ways that have resulted in Turfil sunflowers on the mainland growing to be 40 centimeters taller than they did two centuries ago. [This tells us the height of TM Sunflowers has not changed because the environment is same. If this is correct, then the sunflowers in TM have the same height and sunflowers in TI could be smaller because of dryness] [Negation test can also be used to test this - I didn't check silly me!]
D. The soil on Tufe Island, unlike that on the mainland, lacks important nutrients that help Turfil sunflowers survive and grow tall in a dry environment. [This would give alternate reasons for the lack of growth in height and weaken the authors conclusion, so this can't be our answer]
E. The 40-centimeter height difference between the Turfil sunflowers on Tufe Island and those on the mainland is the only difference between the two populations.[I chose this, but this cannot be the correct answer, let's negate this and assume that even if there is some other difference between the two populations, how does that help us in concluding that difference is because of the environment difference? It doesn't hence this is incorrect]

Would be glad if someone can verify these.

Regards,
Squib
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Re: Two centuries ago, Tufe Peninsula became separated form the mainland,  [#permalink]

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24 Oct 2018, 06:28
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: Two centuries ago, Tufe Peninsula became separated form the mainland, &nbs [#permalink] 24 Oct 2018, 06:28

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