Your biology professor takes the class on a field trip to a local lake. You spend an hour studying the lake and writing down all observations. You hypothesize that the lake is oligotrophic. Which observations would support this hypothesis? Check all that apply.
A. The lake has little planktonic growth.
B. An oxygen probe reveals low oxygen content in the water.
C. The lake has extensive aquatic plant beds.
D. The shoreline is mostly rock and sand with very little vegetative matter.
E. The bottom of the lake is easily visible.
Answer: E
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