More often is the argument used that similar DNA structures in two different organisms proves common evolutionary ancestry. There is no reason whatever why the Creator could not or would not use the same type of genetic code based on DNA for all His created life forms.This is evidence for intelligent design and creation, not evolution. There are many even more bizarre comparisons yielded by this approach.Neither is there any clue as to how the one-celled organisms of the primordial world could have evolved into the vast array of complex multi-celled invertebrates of the Cambrian period.Even dogmatic evolutionist Gould admits that: Equally puzzling, however, is how some invertebrate creature in the ancient ocean, with all its "hard parts" on the outside, managed to evolve into the first vertebrate -- that is, the first fish-- with its hard parts all on the inside. Generally, it seems that major groups are not assembled in a simple linear or progressive manner -- new features are often "cut and pasted" on different groups at different times.All that paleoanthropologists have to show for more than 100 years of digging are remains from fewer than 2000 of our ancestors.
They used to claim that the real evidence for evolution was in the fossil record of the past, but the fact is that the billions of known fossils do not include a single unequivocal transitional form with transitional structures in the process of evolving. it followed logically that the fossil record should be rife with examples of transitional forms leading from the less to the more evolved.Creationists also would anticipate that any "vertical changes" in organized complexity would be downward, since the Creator (by definition) would create things correctly to begin with.Thus, arguments and evidences against evolution are, at the same time, positive evidences for creation.Nevertheless, because of the lack of any direct evidence for evolution, evolutionists are increasingly turning to dubious circumstantial evidences, such as similarities in DNA or other biochemical components of organisms as their "proof" that evolution is a scientific fact.A number of evolutionists have even argued that DNA itself is evidence for evolution since it is common to all organisms.