Why is it possible for an amino acid to be specified by more that one kind of codon

The  central dogma  of molecular biology is centered upon the process of protein synthesis, in which the information from dna is transcribed and translated, resulting in multiple amino acids being joined to form a)lipidsb)proteinsc)carbohydratesd) nucleic acids

What word is used to describe differences of individual organisms

For this question look at the hydropic diagram water that is heated by the sun evaporates. select the number that represents it.