The blue protein making the RNA is called DNA polymerase. What similarities does it have with DNA polymerase (the protein that copies
DNA)?

Formation of sea ice increases the salinity of the oceans

When ice form in water, this water is ‘osmotically isolated’ (in solid form) hence making liquid water become lesser in quantity than before. Since the number of dissolved salts remain more or less the same and the liquid water in which it is dissolved has reduced, then the water becomes more concentrated