easy · LSAT Logical Reasoning
Migratory songbirds appear to navigate partly by sensing the Earth's magnetic field. In controlled experiments, their orientation becomes erratic whenever a fluctuating artificial magnetic field is introduced nearby. These birds must therefore possess some internal magnetic sensor. Because such a sensor could be disturbed by widespread electronic infrastructure, urban expansion may pose an unrecognized threat to their migration.
The claim that these birds must possess some internal magnetic sensor plays which one of the following roles?
- It is an unsupported premise used to infer that electronic infrastructure threatens migration, rather than a conclusion drawn from the magnetic-field experiment described earlier.
- It is in fact a premise for which the argument offers no support.
- An intermediate conclusion supported by experimental results and used to support the final conclusion.
- It is the argument's main conclusion.
- It is a hypothesis that the argument ultimately abandons.
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