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Nature & Animals

Which risk increases for salmon migrating upstream when unusually strong geomagnetic storms occur?

A)Disrupted olfactory map construction accuracy
B)Increased susceptibility to parasitic infections
C)Elevated metabolic demand during travel
D)Dehydration from increased river turbulence

💡 Explanation

Geomagnetic storms disrupt the detection of the Earth's magnetic field, impairing their magnetic compass during migration, because it affects the sensing organ; navigation requires olfactory maps; therefore misdirection, disorientation risk increases via impaired senses of magnetic variation signals, rather than other metabolic effects.

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