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

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30 Jul 2008, 16:31
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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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Re: CR:1000 - Fire ants from Brazil [#permalink]

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30 Jul 2008, 16:52
Tough one. IMO D

(A) The imported insects would not prove more damaging to the environment in the United States than are the fire ants themselves.
the given facts states that the bringing them will benefit the environment
(B) The predator insects from Brazil could survive in the ecological environment found in the United States.
If this is not assumed then its not point bringing them.
(C) The especially aggressive fire ants from the two-queen nests would not be able to destroy the Brazilian predator insects.
Again if this is not assumed then its no point bringing them.
(D) The predator insects would stop the increase of the ant population before the ants spread to states that are farther north.
Nothing is mentioned about the direction in which the predator is expected to stop the growth of the fire ants
(E) The rate of increase of the fire-ant population would not exceed the rate at which the predator insects could kill the ants.
Same as C
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Re: CR:1000 - Fire ants from Brazil [#permalink]

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31 Jul 2008, 03:59
none of the choices really stuck out to me, but ill go with D
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Re: CR:1000 - Fire ants from Brazil [#permalink]

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31 Jul 2008, 04:27
D as well.

I negated all the answer choices, and D did not fall apart.
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Re: CR:1000 - Fire ants from Brazil [#permalink]

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31 Jul 2008, 12:18
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Re: CR:1000 - Fire ants from Brazil [#permalink]

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01 Aug 2008, 00:17
hanumayamma wrote:
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.

IMO D)
Re: CR:1000 - Fire ants from Brazil   [#permalink] 01 Aug 2008, 00:17
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