All life forms have contained DNA and use the same four nitrogenous bases--adenine, thymine, cytosine and guanine in their genetic code to synthesize proteins. DNA helps in defining the evolutionary relationship “utilizing a sequence of DNA “the connection between the living beings is dictated by their DNA sequence. The arrangement of the nucleotides in DNA of the life forms are particular and are controlled by the researcher who utilizes this data and looks at the arrangement and discovers the similitudes in this manner helping in the characterizing the advancement relationship of living beings. These data likewise used to characterizes the distinction between organisms. Researcher likewise utilized the sequence to find it.