What is the greatest source of oxygen in deep water?
a. The respiration from bacteria
b. The lack of large quantities of organisms
c. Chemosynthesis
d. Polar waters that have sunk from the surface
ANS: D
Polar waters are very rich in nutrients, including oxygen. This water sinks from the surface in these
regions and then circulated through deep water. Information can be found in the section Gases
Dissolve in Seawater
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