Use the Following Figure to Answer the Question

question 30

Multiple Choice

Use the following figure to answer the question.

After looking at the experiment in the figure, what can be concluded 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.

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