The absence of animals will not affect the salinity of ocean water.
Nothing will happen to the salinity of the ocean if animals were no longer living in it because animals and salinity of water is not related to each other.
The animals are not the source of salinity and not feed on it. The salts comes in the ocean from the water that flows from rocky mountainous regions so we can conclude that the absence of animals will not affect the salinity of ocean water.
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