What do you think would result if nitrogen-fixing cyanobacteria populations suddenly declined?
A. Populations of denitrifying bacteria would expand to take over their role, creating only a temporary disruption.
B. Both the aquatic and terrestrial populations of autotrophs would collapse.
C. Legumes would cease to grow, but other types of plants would be unaffected.
D. More nitrogen would become available for other aquatic autotrophs.
E. Aquatic primary production would decline, particularly in regions not subject to fertilizer runoff.
Answer: E
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