The use of frog DNA is extra justified in the book, in which it truly is indicated only a number of decide on species have fragments of frog DNA, and the majority of the DNA made use of to take care of up dinosaur DNA is avian or reptilian the other justification provided is that DNA only has minimal genetic discrepancies across all forms of life,note The genetic variation involving the DNA of a bacterium and a human is about 10% with the.