Fire ants from Brazil now infest the southern United States. : GMAT Critical Reasoning (CR)
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# Fire ants from Brazil now infest the southern United States.

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Fire ants from Brazil now infest the southern United States. [#permalink]

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19 Nov 2006, 09:34
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3. Fire ants from Brazil now infest the southern United States. Unlike queen fire ants in Brazil, two queens in the United States share a nest. Ants from these nests are more aggressive than those from single-queen nests. By destroying virtually all insects in the nest area, these aggressive ants gain sole access to food sources, and the ant population skyrockets. Since certain predator insects in Brazil limit the fire-ant population there, importing such predator insects into the United States would be of overall benefit to the environment by stopping the increase of the fire-ant population in the United States.
Each of the following is an assumption made in the argument EXCEPT:
(A) The imported insects would not prove more damaging to the environment in the United States than are the fire ants themselves.
(B) The predator insects from Brazil could survive in the ecological environment found in the United States.
(C) The especially aggressive fire ants from the two-queen nests would not be able to destroy the Brazilian predator insects.
(D) The predator insects would stop the increase of the ant population before the ants spread to states that are farther north.
(E) The rate of increase of the fire-ant population would not exceed the rate at which the predator insects could kill the ants.
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19 Nov 2006, 09:40
I go with D
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Re: CR on Fire ants ! [#permalink]

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19 Nov 2006, 09:46
jyotsnasarabu wrote:
3. Fire ants from Brazil now infest the southern United States. Unlike queen fire ants in Brazil, two queens in the United States share a nest. Ants from these nests are more aggressive than those from single-queen nests. By destroying virtually all insects in the nest area, these aggressive ants gain sole access to food sources, and the ant population skyrockets. Since certain predator insects in Brazil limit the fire-ant population there, importing such predator insects into the United States would be of overall benefit to the environment by stopping the increase of the fire-ant population in the United States.
Each of the following is an assumption made in the argument EXCEPT:
(A) The imported insects would not prove more damaging to the environment in the United States than are the fire ants themselves.

If the insects cause more damage, then there is no point in importing them. This is assumed.

(B) The predator insects from Brazil could survive in the ecological environment found in the United States.

If the insects can't survive the environment, then there is no point in importing them. This is assumed.

(C) The especially aggressive fire ants from the two-queen nests would not be able to destroy the Brazilian predator insects.

If the insects can't survive aggressive fire ants from the two-queen nests, then there is no point in importing them. This is assumed.

(D) The predator insects would stop the increase of the ant population before the ants spread to states that are farther north.

Argument says "importing such predator insects into the United States would be of overall benefit to the environment by stopping the increase of the fire-ant population in the United States" No where is the mention of north. It is almost assumed in the argument that ants will spread through out the united states. So my answer is D.

(E) The rate of increase of the fire-ant population would not exceed the rate at which the predator insects could kill the ants.

The argument says "Since certain predator insects in Brazil limit the fire-ant population." From this statement I think we can assume that the rate of increase of ants will be only high enough that insects will be able to control the ants. So E is also assumed.

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19 Nov 2006, 10:18
would be of overall benefit to the environment by stopping the increase of the fire-ant population in the United States.

This lends me to believe that choice D could be an assumption..

I know that specifically the north wasn't mentioned, but I took the argumen to imply the predators would stop the spread of ants to other regions in the US..

but D seemed like the only choice you couldn't poke a big hole in.

Nevermind!.. Negating choice D doesn't make the argument fall apart.

If the ants don't migrate north, they could still migrate to other areas of the country
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19 Nov 2006, 17:45
I'll take D. All of the other choices are required in order for the conclusion to stand. D is not an assumption because without it (or if it's false), the conclusion is not going to collaspe.
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19 Nov 2006, 19:12
amorica wrote:
would be of overall benefit to the environment by stopping the increase of the fire-ant population in the United States.

This lends me to believe that choice D could be an assumption..

I know that specifically the north wasn't mentioned, but I took the argumen to imply the predators would stop the spread of ants to other regions in the US..

but D seemed like the only choice you couldn't poke a big hole in.

Nevermind!.. Negating choice D doesn't make the argument fall apart.

If the ants don't migrate north, they could still migrate to other areas of the country

amorica, increasing is different from spreading. Increasing has to do with density. Spreading has to do with area. No?
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19 Nov 2006, 20:14
D is the only choice...
19 Nov 2006, 20:14
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