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Updated on: 23 Jul 2014, 01:04
4
12
00:00

Difficulty:

55% (hard)

Question Stats:

60% (01:25) correct 40% (01:20) wrong based on 470 sessions

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The Canadian elk has traditionally been limited in its geographic range by the presence of elderberries, its primary source of food, which only grow up until a certain point in the tundra. A recent rise in temperatures, however, has seen a spread in the growth of elderberries northwards into the tundra. Therefore, the overall range of the Canadian elk can be expected to increase.

Which of the following, if true, best casts doubt on the argument?

A)In addition to elderberry, the Canadian elk also consumes loganberries, which are expected to also begin growing at more northerly latitudes.

B)During the summer months, many Canadian elk are hunted both for sport and for their meat.

C)The grizzly bear, the Canadian elk’s primary predator, has also started moving north into the tundra.

D)The permafrost, the region above the tundra, in which the temperatures never reach above freezing, will unlikely see elderberry growth.

E)Increasing temperatures have created conditions too warm for elderberry growth in the southern half of the Canadian elk’s traditional territory.

Originally posted by guerrero25 on 21 Jul 2014, 23:35.
Last edited by PiyushK on 23 Jul 2014, 01:04, edited 3 times in total.
formatted
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22 Jul 2014, 04:42
5
we have scope shift in this argument.
it explains that a recent rise in temp. has spread the growth of Canadian elk's food northward.
and then concludes that the overall range of the Canadian elk can be expected to increase.
for the argument to hold true the author must assume that the current range will not decrease.

Which of the following, if true, best casts doubt on the argument?

A)In addition to elderberry, the Canadian elk also consumes loganberries, which are expected to also begin growing at more northerly latitudes.
the argument talked only about elderberry

B)During the summer months, many Canadian elk are hunted both for sport and for their meat.
the reason for hunting Canadian elk is out of the scope of the argument

C)The grizzly bear, the Canadian elk’s primary predator, has also started moving north into the tundra. The permafrost, the region above the tundra, in which the temperatures never reach above freezing, will unlikely see elderberry growth.
the argument talks about the range of Canadian elk, not its predator!

D)The permafrost, the region above the tundra, in which the temperatures never reach above freezing, will unlikely see elderberry growth.
the argument talks about the growth of elderberries northwards into the tundra.... the region above tundra is out of scope

E)Increasing temperatures have created conditions too warm for elderberry growth in the southern half of the Canadian elk’s traditional territory.
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22 Jul 2014, 09:08
2
1
The argument is that the elk’s territory will grow because the elderberry, its primary food source, is expected to grow further north. (E) calls this conclusion into question because if elderberries can no longer grow in the southern half of the elk’s territory, then the elk's range has been truncated. There is no information concerning how far north the new territory will reach.

(A) suggests that elk will be very well provided for, diet-wise, as they move into the tundra.

(B) is just a general fact that does not relate to the argument.

(C) may be tempting but remember that just because the grizzly bear will continue to prey on the elk as it moves into the tundra does not mean there will be no elk in the tundra.

(D) is out of scope because the argument only concerns the tundra, not the area north of the tundra.
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22 Jul 2014, 10:34
I marked C. How can E be correct? It talks about southern part and not northern.
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22 Jul 2014, 15:42
2
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vaggar4 wrote:
I marked C. How can E be correct? It talks about southern part and not northern.

The Canadian elk currently lives in the southern part of the tundra. The conclusion of the argument states that the presence of elderberries in the north will cause the range (overall size of where the elk lives) to increase. We are trying to weaken that conclusion, so the answer will provide information that will make that conclusion seem invalid (or wrong).

Answer choice E states that the southern area of the tundra (where the elk currently live) has temperatures that are too high for elderberry growth. This would mean that elk can't continue to live in the south. The elk aren't seeing an expansion of their living territory to include both the north and the south - they are seeing their living area shift from the south to the north. This information about the elderberries in the southern tundra invalidates the conclusion that the range of elk will increase, making E the correct answer.

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12 Jul 2016, 07:44
increase in range means that the starting point is fixed and the ending point moves up the line.

Which of the following, if true, best casts doubt on the argument?

A)In addition to elderberry, the Canadian elk also consumes loganberries, which are expected to also begin growing at more northerly latitudes.
This gives us no reason to believe that the range will not increase
B)During the summer months, many Canadian elk are hunted both for sport and for their meat.
no reason whyy the range will not increase
C)The grizzly bear, the Canadian elk’s primary predator, has also started moving north into the tundra.
Increase in range yea./nah dunno

D)The permafrost, the region above the tundra, in which the temperatures never reach above freezing, will unlikely see elderberry growth.
where is this region far far away in the north. i dunno Increase or decrease no idea.
E)Increasing temperatures have created conditions too warm for elderberry growth in the southern half of the Canadian elk’s traditional territory.

for range to not increase if it moves up. the starting point will also move up. therefore wither the range is less or the same but it does not increase
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12 Jan 2018, 05:10
each of option choices in this question contains the common pattern that keeps appearing in other CR questions. The issue here is the key word. Here, "overall range" is what makes E correct.
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