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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.
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Personally I don't agree with the study that birth order has such decisive effects on individual's levels of stimulation. This perceptive is to partial because the stimulation of an individual is related to many factors not only the order of birth.
In society the factors of an individual's success are education, life experience, competence of communication, living environment and so on, not just the order of birth. You can see many instances about it in many domains. For example, Mr.Li Jia Cheng is the most famous enterpreneur in Hong Kong, he has several sons to help him to do the business. His first son named Li ZeJu and he manage Li's enterprises within Hong Kong, he is a mature and quiet man so he is not so well-known by public and medias though he manages business well. By comparison, Li Jia Cheng's second son is MrLi ZeKai, he runs all businesses belong Li's family throughout the world related to many fields such as Electrons, estate, transportation, biologic mechanical and so on. He is an active man and is well-known in entertain, economic and other fields. Nearly every public people in Hong Kong know Mr.Li Jia Cheng's second son rather than the first one. So this is an evidence to contradict the theory about order of birth effects in one's stimulation.
Not only in Hong Kong, many descendants who were not born first also do fantastic jobs in different kinds of domains. In business and political fields, not all the officials were in the first order birth of their families but actually their education, abilities and knowledge help them to succeed.
Consequently, I doubt this study cannot turn out the relationship between birth order and stimulations and in my opinion it's not scientific.
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