# Final questions

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5. Thermohaline circulation is best described as:
a) Cold, oxygen rich waters moving across the ocean bottoms where they remain
b) A worldwide system of rising and sinking water masses due to density changes caused by changes in temperature and salinity.
c) A slow circulation (on the order of a thousand years for one cycle).
d) B and C
e) All of the above
6. Is the oxygen a limiting factor for organisms in the deep ocean?
a) No, as oxygen diffuses from the epipelagic zone
b) Yes, but only in areas where primary producers (e.g., oxygen-producing
bacteria from deep trenches) cannot sustain efficient production of oxygen
c) No, as the rates of oxygen consumption in deep-water environments are low compared to the supply of waters from polar regions
d) Depends on the proximity to the thermocline