The following figure shows studies in a stream where enclosures were set up either with trout or with no trout. Which statement is a correct interpretation of the graph about trout, invertebrates, and algae?
A. If trout are present in a system, algae production is low and invertebrate population levels are also low.
B. If trout are present in a system, algae production is high and invertebrate population levels are also high.
C. If trout are present in a system, algae production is high and invertebrate population levels are low.
D. Trout do not seem to affect the algae production; only the invertebrate populations are affected.
E. Trout do affect the algae production but not the invertebrate populations.
C. If trout are present in a system, algae production is high and invertebrate population levels are low.
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