medium · SAT Reading & Writing
In her analysis of the migration patterns of the arctic tern, biologist S. V. Miller suggests that the birds do not rely on a single navigational mechanism, such as magnetoreception, but instead switch between multiple sensory cues depending on atmospheric conditions.
Which finding, if true, would most directly support Miller's suggestion?
- The arctic tern has a specialized group of cells in its beak that are highly sensitive to the intensity and inclination of the Earth's magnetic field.
- When researchers obscured the vision of migrating terns on clear days, the birds immediately flew in the wrong direction and failed to correct their course.
- Arctic terns released in high-latitude regions during heavy fog were unable to maintain a consistent heading unless artificial magnetic fields were applied.
- Migration routes of the arctic tern have remained largely unchanged for several decades despite significant shifts in global climate patterns.
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