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"Arctic deer live on islands in Canada's arctic region. They search for food by moving over ice from island to island during the course of a year. Their habitat is limited to areas warm enough to sustain the plants on which they feed, and cold enough, at least some of the year, for the ice to cover the sea separating the islands, allowing the deer to travel over it. Unfortunately, according to reports from local hunters, the deer populations are declining. Since these reports coincide with recent global warming trends that have caused the sea ice to melt, we can conclude that the decline in arctic deer populations is the result of deer being unable to follow their age-old migration patterns across the frozen sea."

The argument presented is limited but useful. It indicates a possible relationship between the decline in arctic deer populations and recent global warming trends. The statement cited compels a further investigation of the effect of recent global warming trends on the decline of the deer populations. (这里本来应该再分一段) However，the conclusion that the decline in arctic deer populations is the result of deer being unable to follow their age-old migration patterns across the frozen sea because of the recent global warming trends is premature. The decrease is lacking with references to the health of the whole deer population and the relative levels of illness resistance, adaptability to the environment, skill and physical coordination of that population. It is entirely possible that further research would indicate that it leads to the deer populations’ decline that the deer’s health is running本论文由英语论文网 www.51lunwen.org整理提供
down.

The argument presented is limited but useful. It indicates a possible relationship between the decline in arctic deer populations and recent global warming trends. The statement cited compels a further investigation of the effect of recent global warming trends on the decline of the deer populations. The conclusion that the decline in arctic deer populations is the result of deer being unable to follow their age-old migration patters across the frozen sea because of the recent global warming trends, however, is premature. The analysis is lacking in references to the health of the whole deer population and the relative levels of illness resistance, adaptability to the environment, and skill and physical coordination of that population. It is entirely possible that further research would indicate that the reason for the deer populations’ decline is that the deer populations’ health is being run down by other factors.

[评论]：本段只有少数极小的语法错误。

Another area of investigation necessary before conclusion can be reached is identification of the amount of the plants on which the deer feed, the scalar of the melt ice and the degree of the hunting. The article fails to identify whether the plants are sufficient for the deer to feed on. It also fails to correlate the hunting and the deer’s decline. For example, if the majority of the dead deer are because of the lackness本论文由英语论文网 www.51lunwen.org整理提供
of food, it’s the starvation that kills the deer. Likewise, if there are still enough ice to cover the sea separating the islands though recent global warming tr本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。