What physiological phenomenon allows migratory birds to navigate across continents during seasonal migrations?
Answer and explanation
Correct answer: A. geomagnetic sensing and celestial orientation
- Step 1: Migratory birds rely on a sophisticated multi-modal navigation system integrating geomagnetic field detection (magnetoreception). They complement this with celestial navigation, using the position of the sun, polarized skylight patterns, and nocturnal star constellations. Answer: geomagnetic sensing and celestial orientation. Why not the others: "auditory tracking of noisy industrial roadway traffic rumble sound waves" is factually absurd; birds navigate across featureless oceans and remote deserts devoid of roads; "constant ultrasound echolocation calls" is used by bats and toothed whales for short-range obstacle avoidance, not avian navigation; "passive drifting on jet stream currents" would blow birds off their required routes rather than steering them to specific nesting grounds.
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