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100 points for $49 worth of Veritas practice GMATs FREE VERITAS PRACTICE GMAT EXAMS Earn 10 Points Per Post Earn 10 Points Per Thanks Earn 10 Points Per Upvote ## Qs Pack: Two centuries ago, Tufe Peninsula became separated tagged by: RBBmba@2014 ##### This topic has 2 expert replies and 1 member reply ## Qs Pack: Two centuries ago, Tufe Peninsula became separated Two centuries ago, Tufe Peninsula became separated form the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers. This populationâ€™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 Tufeâ€™s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufeâ€™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 mainlandâ€™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. OA: C Hi Verbal Experts, Could you please clarify why Option D is wrong ? ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2094 messages Followed by: 239 members Upvotes: 1443 Top Reply When we're looking for an ASSUMPTION on which the argument DEPENDS, we want to ask ourselves, "does this thing HAVE to be true for the conclusion to hold?" Many students mix up STRENGTHEN and ASSUMPTION questions. For strengthen, we simply ask "does this help the conclusion? Does it make the conclusion more likely to be true?" But it's not necessarily something that has to be true. Here's the structure of this argument: Premises: - Tufe Peninsula became separated form the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers - Tufe Island sunflowers are 40 centimeters shorter than Turfil sunflowers found on the mainland - Tufe Island is significantly drier than Tufe Peninsula was Conclusion: The current average height of Tufeâ€™s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufeâ€™s environmental conditions. Sometimes the best way to find out what the argument is missing is to ask, "is there any way for the conclusion NOT to be true, while keeping the premises true?" We know that the island and the mainland have different environments now, and that the island has shorter sunflowers. We even know that the island is drier than the peninsula used to be. But could there be some way for the height difference in sunflowers NOT to be caused by the island's changes? What about the mainland's changes? We don't know about the height of sunflowers 200 years age. We're assuming the island flowers shrank, but maybe the mainland ones grew! A. There are no types of vegetation on Tufe Island that are known to benefit from dry conditions. Other types of vegetation are irrelevant to our conclusion about sunflowers. B. There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today. NUMBER of sunflowers = irrelevant to conclusion about HEIGHT of sunflowers. C. The mainlandâ€™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. Bingo! Try negating this one - if the mainland's environment DID change, then our conclusion falls apart. 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 one strengthens - it gives more reason to believe that changes on the island affected the sunflower height. But does it HAVE to be true? Nope! Other changes besides the soil could still account for it. If we negate it, it doesn't destroy the argument. 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. Irrelevant. The height difference is the only difference that our conclusion deals with, but it wouldn't have to be the only difference between the two species. Hope that helps! _________________ Ceilidh Erickson Manhattan Prep GMAT & GRE instructor EdM in Mind, Brain, and Education Harvard Graduate School of Education Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience. Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. ### GMAT/MBA Expert GMAT Instructor Joined 04 Dec 2012 Posted: 2094 messages Followed by: 239 members Upvotes: 1443 _________________ Ceilidh Erickson Manhattan Prep GMAT & GRE instructor EdM in Mind, Brain, and Education Harvard Graduate School of Education Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience. Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry! Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week. Master | Next Rank: 500 Posts Joined 05 Jun 2015 Posted: 363 messages Followed by: 2 members Upvotes: 3 HI Ceilidh, /Mitch, In this CR question, Can assumption be only mainlandâ€™s environment has not changed? In general Can assumption be to avoid other alternate reason? 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