1.Arctic deer live on islands in Canada's arctic regions. They search for food by moving over ice from island to island during the course of the year. Their habitat is limited to areas warm enough to sustain the plants on which they feed and cold enough,

The argument claims that, Arctic deers search for food by moving over ice from island to island during the course of the year,Their habitat is limited to areas warm enough to sustain the plants on which they feed and cold enough and for the ice to cover the sea separating the islands and it is able to move deers to another island. Stated in this way, the agrument fail to mention several key factors bases on it could be evaludated. The conclusion relies on an asumption for which, there is no clear evidence, so the author's argument unsubstantiated and incomplete. However, scrutiny of the evidence reveals that it little credible support for the author's conclusion.

First of all, the argument readily assumes that the ice to cover the sea separating the islands, allowing the deer to travel over it. This is merely an asumption made without much solid ground. For example deers migrate to another island with another way. It may be possible deers are died by another wild animal during traveling to the another island. The argument would have been much more convincing if explicitly stated that deers died due to melting ice during migrate on the seperating island.

second, the argument claims that the acoording to the reports from local hunters, the deer populations are declining. this is again weak and unsupported claims as it is does not correlation between hunter view and deer population. For example the hunter not able to see deers during his hunting time then they conclude that deers population decrease. And again local hunters survey is not properly define in argument so, bases on local hunters we can not conclude that deers population decreseif argument had provided, proper reason beetween the hunters and deers then the argumetn would have been a lot more convincing.

finally, the author cites that deer populations is the result of the deer's being unable to follow their age-old migration patterns across the frozen sea. Bases one this we can not conclude that population of deers decreasing due to ice melting. it may be possible there is environment problem face the deer and died. However, scrutiny of the evidence reveals that it little credible support for the author's conclusion.For example it may be possible deers follow another way for migrate. again it is also possible ice not melt at that time and deer hunted by another wild animal. Without the answer of the question reader left with the empression that the claims made by author are more of a wishful rather than substanstive evidence.

In conclusion, the author's argument unpersuasive as it stands. To bolster it further, the author must provides better concrete evidence. It could be considerably strengthened if author metion several relevant facts. In order to assess the several merits it is essential to have good knowledge of contributiog factor. So, the author's argument is unsubtantiated and open for debate.