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OG2016 CR Practice #68.
Which of the following most logically completes the argument? By competing with rodents for seeds, black ants help control rodent populations that pose a public health risk. However, a very aggressive species of black ant, the Loma ant, which has recently invaded a certain region, has a venomous sting that is often fatal to humans. Therefore, the planned introduction into that region of ant flies, which prey on Loma ants, would benefit public health, since
ant flies do not attack black ants other than Loma ants
Loma ants are less effective than many bird species in competing with rodents for seeds
certain other species of black ants are more effective than Loma ants in competing with rodents for seeds
the sting of Loma ants can also be fatal to rodents
some pesticides that could be used to control Loma ants are harmful to the environment

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