First of all, the argument is based on only two studies in one specific part of the world, Yosemite National Park in California. It is impossible to pinpoint a worldwide theory for the decline of amphibians based on any number of studies in only one specific location in the world - the specific varieties of amphibians, geographical conditions and other location specific variables prohibit such a sweeping generalization. One very specific location cannot be used as a model for all other locations, even within one particular country, let alone the entire world. The writer provides no evidenced whatsoever that links the Yosemite study with any purported effects anywhere else in the global environment.
Secondly, the two separate studies were done seventy-five years apart. There is no evidence that the two studies were conducted in a similar manner over the same duration of time or even over the same exact areas of Yosemite National Park, or that the exact same study methods were used. For example, perhaps the first study lasted over an entire year and was conducted by twenty-five experts in amphibious biology, resulting in the finding of seven species of amphibians in abundant numbers. By contrast, perhaps the second study was conducted over a period of one week by a lone high school student as a school science project. The writer offers no basis on which to compare the two studies, leaving it open as to whether the two are truly comparable in their breadth, scope and expertise.
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