求问 argument 83 和84

小葡萄唯CUID: 3103656

[83] [The following is a letter to theeditor of an environmental magazine.]”In 1975 a wildlife census found that there were sevenspecies of amphibians in Xanadu National Park, with abundant numbers of eachspecies. However, in 2002 only four species of amphibians were observed in thepark, and the numbers of each species were drastically reduced. There has beena substantial decline in the numbers of amphibians worldwide, and globalpollution of water and air is clearly implicated. The decline of amphibians in XanaduNational Park, however, almost certainly has a different cause: in 1975,trout—which are known to eat amphibian eggs—were introduced into thepark." [Write a response in which you discuss what specific evidence isneeded to evaluate the argument and explain how the evidence would weaken orstrengthen the argument.]

[84] [The following is a letter to the editor of an environmentalmagazine.]”Two studies of amphibians in Xanadu National Park confirm asignificant decline in the numbers of amphibians. In 1975 there were sevenspecies of amphibians in the park, and there were abundant numbers of eachspecies. However, in 2002 only four species of amphibians were observed in thepark, and the numbers of each species were drastically reduced. One proposed explanationis that the decline was caused by the introduction of trout into the park'swaters, which began in 1975. (Trout are known to eat amphibian eggs.)"[Write a response in which you discuss one or more alternative explanationsthat could rival the proposed explanation and explain how your explanation(s)can plausibly account for the facts presented in the argument.]

应该怎么写呢？

ylhchdUID: 3055726

请先把你自己的分析发上来；

小葡萄唯CUID: 3103656

2# ylhchd
我83想的是 应该提供和这个公园类似的公园的情况； 还要提供amphibians，trout，和egg 之间的变化关系， 还有就是是否是别的什么原因      84写alternative explanation 的时候怎么写呢