Tropical seas have a high rate of evaporation because of the direct rays of the sun. because of this high rate of evaporation, we would expect the water in tropical seas to have than seas in colder climates?

Well,

Since tropical seas have a higher rate of evaporation than in colder climates, and since salt does not escape through evaporation, we would expect the water in tropical seas to have a higher salinity/a higher salt content than seas in colder climates.

The answer is forindependence.