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← Nature & AnimalsWhich risk arises when migratory birds encounter rapid deflections in Earth's magnetic field?
A)Increased susceptibility to brood parasitism
B)Disrupted endogenous circannual rhythms
C)Erroneous perception of migration direction✓
D)Heightened energetic expenditure for flight
💡 Explanation
Navigation relies on a magnetic compass; a deflected field disrupts the internal compass, therefore producing navigation errors, rather than affecting rhythms or brood parasitism. Magnetoreception, using cryptochrome proteins is the mechanism affected.
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