Why Do Some Water Masses in Subsurface Oceans Have Little

question 24

Multiple Choice

Why do some water masses in subsurface oceans have little or no oxygen?

• A)Rates of photosynthesis are low in overlying waters, limiting the availability of oxygen.
• B)Rates of photosynthesis are high in overlying waters, supporting high rates of respiration in waters that deplete the oxygen there.
• C)Waters underneath the surface oceans are cold and so have a limited capacity to carry oxygen in solution.
• D)Large carnivores deplete oxygen in subsurface oceans via their high rates of oxygen metabolism.

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