Figure 54.4 -After Looking at the Experiment in Figure 54.4,what Can Be

Multiple Choice

Figure 54.4
-After looking at the experiment in Figure 54.4,what can be said about productivity in marine ecosystems?

A) Nothing can be said based on this information.
B) Marine organisms break down iron for energy and thus for productivity.
C) Iron can be a limiting nutrient in productivity.
D) Productivity increases when chlorophyll a is added.