The following appeared as part of a letter to the editor of a scientific journal.
"A recent study of eighteen rhesus monkeys provides clues as to the effects of birth order on an individual's levels of stimulation. The study showed that in stimulating situations (such as an encounter with an unfamiliar monkey), firstborn infant monkeys produce up to twice as much of the hormone cortisol, which primes the body for increased activity levels, as do their younger siblings. Firstborn humans also produce relatively high levels of cortisol in stimulating situations (such as the return of a parent after an absence). The study also found that during pregnancy, first-time mother monkeys had higher levels of cortisol than did those who had had several offspring."
Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation(s) can plausibly account for the facts presented in the argument.
In this argument author is publishing the result of behavioral study performed on the rhesus monkeys and firstborn humans. The results is unconvincing as it has many loop holes and can be undermined by many explanations.
Firstly, study was performed on eighteen rhesus monkeys which is unacceptable number of samples to study any habitat. If writer would have specified population of rhesus monkeys in existence and if the samples were in commensurate with the population, this could have strengthen or weaken the argument. If we are studying behavior of any species we need ensure that we have covered at least thousands of samples before concluding. If writer would have specified about rare existence of rhesus monkeys it would have supported the results. Writer didn't specify habitat of monkeys which were study. It may not hold true that monkeys from other habitat will respond to study in same way as rhesus monkeys.
It may hold true that few firstborn infant monkeys produces high-level of chromosomes but here as well author failed to mention that number of firstborn infant monkeys considered during study. Even if all eighteen rhesus monkeys were new born still they are insufficient to determine the behavior. Author repeatedly fail to provide the numbers which makes this study involved. Author failed to expound the reason for high levels of cortisol in the firstborn. No pragmatic evidence is provided to strengthen the argument.
In case of firstborn human behavior study, there are thousands of baby born every seconds. Human behavior is most complex and unpredictable. Some babies may produce high levels of cortisol in situation when parents return after long time, but doesn't that hold true for only firstborn babies. My experience says it hold true for all babies. My brother just had second baby who is more excited then his sibling when he sees parents and his smile is worth watching. Human behavior is involved and cannot be studied or predicted. We humans ourselves raise our kids in our own way. Parents who are attached to their kids, kids responds with same affection and love irrespective they are firstborn or second.
Lastly, study on eighteen rhesus monkeys, undisclosed number of firstborn monkey and humans cannot be applied on all the species. Monkeys and humans behavior have lots of things in common. Study result would have been convincing and hold true if more diverse species were part of the study. There are extreme behavioral differences from one species to other. Carnivorous animals are detached from their babies from birth so that they can be independent and self-sufficient.
To conclude, lack of details like sample count and study of similar inhabitant make the argument weak and implausible.
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flaws:
This is a new GRE essay topic. and you didn't read the topic completely. It is a little bit different to old GRE essays.
'Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation(s) can plausibly account for the facts presented in the argument.'
Read the explanations:
http://www.testbig.com/gmatgre-essays/following-appeared-part-letter-ed…
Attribute Value Ideal
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Category: ? Excellent
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No. of Spelling Errors: 0 2
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No. of Words: 448 350
No. of Characters: 2259 1500
No. of Different Words: 219 200
Fourth Root of Number of Words: 4.601 4.7
Average Word Length: 5.042 4.6
Word Length SD: 2.587 2.4
No. of Words greater than 5 chars: 174 100
No. of Words greater than 6 chars: 126 80
No. of Words greater than 7 chars: 78 40
No. of Words greater than 8 chars: 52 20
Use of Passive Voice (%): 0 0
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Sentence Length SD: 6.081 7.5
Use of Discourse Markers (%): 0.481 0.12
Sentence-Text Coherence: 0.282 0.35
Sentence-Para Coherence: 0.502 0.50
Sentence-Sentence Coherence: 0.102 0.07
Number of Paragraphs: 6 5