What is created due to the decomposition of falling biological debris and zooplankton activity?
a. Bioluminescence
b. Oxygen minimum zone
c. Compensation depth
d. Disphotic zone
ANS: B
The oxygen minimum zone is below the surface zone. Oxygen gets depleted by the animals there, but
is not replaced by photosynthesis. Information can be found in the section Zooplankton Consume
Primary Producers.
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