Salinity and density share a positive relationship. As density increases, the amount of salts in the water—also known as salinity, increases. Various events can contribute to change in the density of seawater. Salinity can decrease from the melting of polar ice or increase from the freezing of polar ice.
It is a hollow ball of cells formed after a fertilized cell undergoes cell division.
I'm a Biology major, hope I helped :)
