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Nature & Animals

Which outcome influences krill populations given decreased sea-ice algae?

A)Antarctic nitrogen fixation rate declines proportionally
B)Upwelling nutrient distribution patterns shift dramatically
C)Photic zone carbon sequestration slows substantially
D)Surface-water denitrification rates increase anomalously

💡 Explanation

Decreased algae reduce krill which feed on nitrogen-fixing bacteria; reduced food availability decreases the rate of nitrogen fixation because the bacteria are no longer supported by the food chain; therefore fixation slows, rather than other environmental processes slowing without this support.

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