What is the primary method through which deep ocean water becomes oxygenated?
A) Photosynthesis by deep-sea plants.
B) Downwelling of surface water.
C) Volcanic activity.
D) Diffusion from the atmosphere.

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What is the primary method through which deep ocean water becomes oxygenated?A) Photosynthesis by deep-sea plants. B) Downwelling of surface water. C) Volcanic activity. D) Diffusion from the atmosphere.