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Logical Reasoning Answers - Ivy Global

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Preptests 56 <strong>Answers</strong> and Explanations (By <strong>Ivy</strong> <strong>Global</strong>)The reasoning is implicit and informal: only conservationists can preserve the second-growthforests.Answering the Questiona) There may very we be another habitat that supplies insects and fruits, but there also may beother reasons that second-growth forests are necessary (perhaps the climate, foliage, etc)b) Since the conclusion is that we need intervention from conservationists, then we need toknow that conservationists are the only ones who can preserve second-growth forests, notthat some will.c) These are just needed for the flourishing of spider monkeys, not necessarily their survival.d) This is a reversal of the conclusion.e) This is the correct answer. The intervention of conservationists is required in order forsecond-growth habitats to be preserved, and in turn for spider monkeys to survive.Double-Checking the AnswerThis is the only answer choice that must be true based on the information given.24. Analyzing the StimulusThe conclusion is indecisive: there must have been many more Byzantine documents sealed withlead than lead seals.The evidence is certain: other than in rare special cases, lead seals were recast once they servedtheir purpose to cut costs.The reasoning is implicit and informal: since the seals were recast but new documents werecreated, there are less seals than documents.Answering the Questiona) This is the correct answer. If the seals were opened during this period, then the author’sreasoning stands. If they weren’t, then the idea that the seals were recast would beundermined, since we don’t know if anyone used lead seals after the Byzantine Empire.b) It doesn’t matter if the documents were destroyed, just the seals.c) The amount of lead available is out of scope. We’re told the seals were recast not becauseof the amount, but the cost.d) If there were at most 40 000 documents, then the argument is undermined, since that is thesame number as there were seals.e) The number of seals “at a given time” is out of scope—we’re talking about as a whole,during the entire period.Double-Checking the AnswerThis is the only answer choice that strengthens the argument by finding the gap in reasoningand attempting to bridge it.25. Analyzing the StimulusThe farmer’s conclusion is decisive: it is counter-productive in the long run to use insecticides.The evidence is certain: insects build up resistance to insecticide, so the cost of buying more andmore insecticide builds.Answering the Questiona) It is a premise, not a conclusion.<strong>Ivy</strong> <strong>Global</strong>

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