Sessile benthos in a hypoxic zone generally begin to die when oxygen in the water drops to ________ ppm.
A. 5
B. 15
C. 0
D. 2
E. 10
Answer: D
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A. retreat of the seas B. deposition of the top layer C. erosion of a canyon by a river D. formation of the lowest layer
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Answer the following statement true (T) or false (F)
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