Use the Following Figure to Answer the Question

question 1

Multiple Choice

Use the following figure to answer the question. After looking at the evidence from the experiment in the figure, which of the following is the most accurate conclusion 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 availability limits productivity.
• D) Productivity increases when chlorophyll a is added.

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