A culture of spirogyra (a photosynthetic alga) is maintained in a water solution containing dissolved carbon dioxide and a source of phosphates but lacking nitrogen compounds. A researcher determines the rates of synthesis of several organic compounds found in the spirogyra before and after several weeks in the water solution. Which of the following graphs best illustrates a likely result of the experiment?.
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A culture of spirogyra (a photosynthetic alga) is maintained in a water solution containing dissolve...
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