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Compilation of Data from Many Experiments on Nutrients and NPP

Question 54

Multiple Choice

Compilation of data from many experiments on nutrients and NPP in marine ecosystems shows that ecosystems with hard bottoms are generally limited by _____, while soft-bottomed ecosystems are generally limited by _____.


A) nitrogen; phosphorus
B) nitrogen; nitrogen and phosphorus
C) phosphorus; nitrogen
D) phosphorus; nitrogen and phosphorus

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