In the surface waters of oceans, the two most limiting nutrients for primary productivity are
A. sulfur and phosphorus.
B. sulfur and nitrogen.
C. nitrogen and iron.
D. nitrogen and phosphorus.
Answer:C
In the surface waters of oceans, the two most limiting nutrients for primary productivity are
A. sulfur and phosphorus. B. sulfur and nitrogen. C. nitrogen and iron. D. nitrogen and phosphorus.