Verified Answer :

Surface Mixed Zone, because the warmest is at the surface so it'll get the most sunlight. etc. It stays the warmest because warm water is less dense than cool water. Layers in the ocean are very well-defined since the warm water on top will stay warm and the cold water stays cold. 

The warmest waters would be found in a surface-mixed zone because the ocean is heated in a way that is not uniform by the sun. The surface is what gets the most exposure to the sun, making it the warmest, and the deepest parts of the ocean so cold with the least exposure to sunlight.

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