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Evolutionists' advancement of homology as evidence for evolution is invalid not only at the morphological level, but also at the molecular level. Evolutionists say that the DNA codes, or the corresponding protein structures, of different living species are similar, and that this similarity is evidence that these living species have evolved from common ancestors, or else from each other.In truth, however, the results of molecular comparisons do not work in favour of the theory of evolution at all. There are huge molecular differences between creatures that appear to be very similar and related. For instance, the cytochrome-C protein, one of the proteins vital to respiration, is very different in living beings of the same class. According to research carried out on this matter, the difference between two different reptile species is greater than the difference between a bird and a fish or a fish and a mammal. Another study has shown that molecular differences between some birds are greater than the differences between those same birds and mammals. It has also been discovered that the molecular difference between bacteria that appear to be very similar is greater than the difference between mammals and amphibians or insects.162Similar comparisons have been made in the cases of haemoglobin, myoglobin, hormones, and genes and similar conclusions are drawn.163Concerning these findings in the field of molecular biology, Dr. Michael Denton comments:
Each class at a molecular level is unique, isolated and unlinked by intermediates. Thus, molecules, like fossils, have failed to provide the elusive intermediates so long sought by evolutionary biology… At a molecular level, no organism is "ancestral" or "primitive" or "advanced" compared with its relatives… There is little doubt that if this molecular evidence had been available a century ago… the idea of organic evolution might never have been accepted.164