Which areas of the ocean experience the greatest variation in salinity?

Of the five ocean basins, the Atlantic Ocean is the saltiest. On average, there is a distinct decrease of salinity near the equator and at both poles, although for different reasons. Near the equator, the tropics receive the most rain on a consistent basis. Oceans and seas cover roughly 70 per cent of the world, and contain about 97 per cent of the Earth's water, and yet, the water is undrinkable due to the salt levels

what subject is this

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: