If Rates of Nitrogen Fixation Increased Tenfold in Terrestrial Ecosystems

Multiple Choice

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

A) Yes, because nitrogen is a limiting nutrient in terrestrial ecosystems.
B) Yes, because there is an abundance of carbon dioxide in terrestrial ecosystems.
C) No, because there are other limiting nutrients in terrestrial ecosystems besides nitrogen.
D) No, because there would be a higher increase in primary productivity.