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← GeographyWhich outcome occurs when Antarctic krill populations decline significantly?
A)Shifting sedimentary structures on sea floor✓
B)Increased atmospheric CO2 sequestration rate
C)Accelerated coastal glacial ice sublimation
D)Weakened thermohaline current circulation
💡 Explanation
Changes in krill abundance alter the rate of bioturbation; sediment reworking decreases because less krill disturb the seabed. Therefore, larger, more stable, sedimentary structures form, rather than a constantly mixed seafloor where small organisms redistribute particles.
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