If Rates of Nitrogen Fixation Increased Tenfold in Aquatic Ecosystems

Multiple Choice

If rates of nitrogen fixation increased tenfold in aquatic ecosystems, would you expect a tenfold increase in primary productivity?

A) yes, because nitrogen is a limiting nutrient in aquatic ecosystems
B) yes, because there is an abundance of dissolved carbon dioxide in aquatic ecosystems
C) no, because there are other limiting nutrients in aquatic ecosystems besides nitrogen
D) no, because there would be a higher increase in primary productivity