Why is the limitations on supplies of freshwater becoming an increasing problem despite the fact that we have desalination technologies

Ithink the dna sequences may vary but the amino acid sequences are identical. 

The main role of dna in the  cell is the long-term storage of information. it is often compared to a blueprint, since it contains the instructions to construct other components of the  cell, such as  proteins  and rna molecules.the main function of rna is to carry information of amino acid sequence from the genes to where  proteins  are assembled on  ribosomes  in the  cytoplasm. mark brainliest, my work is good.

The answer is c water is the solvent and salt is the solvent