D The water temperature is kept constant throughout different depths due to the sun.
Explanation:
Solar radiations serve to keep the water temperature constant throughout the depth of ocean. The surface water temperature is maintained up to the range of 25-28 degree C. Similarly, the temperature at depths of 1000 m is maintained up to 4-5 degree C. The process of convection and mixing as caused by surface perturbation maintain the temperature distribution in marine ecosystems.
The answer to this is C because when the sun shines on the water it tends to heat up because water is like a mirror it reflects the light of it but in doing so it is heating up the water making the water really hot.
