Final answer:
The percentage of oxygen dissolved in seawater is greater in surface waters due to atmospheric contact and the presence of photosynthetic organisms. This oxygen concentration tends to decrease in the deep ocean.
Step-by-step explanation:
The statement is true. The percentage of oxygen dissolved in seawater is indeed greater in surface waters than in the deep ocean. This is mainly because the surface of the ocean is in contact with the atmosphere, which has a high concentration of oxygen. Moreover, photosynthetic organisms like phytoplankton live near the surface of the ocean and produce oxygen during daylight hours. Deep ocean waters, on the other hand, are cut-off from these oxygen sources, and the oxygen present there can be depleted by respiration and decomposition processes.
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