>>36211https://www.sciencefocus.com/the-human-body/how-long-does-dna-last/>A study of DNA extracted from the leg bones of extinct moa birds in New Zealand found that the half-life of DNA is 521 years. So every 1,000 years, 75 per cent of the genetic information is lost. After 6.8 million years, every single base pair is gone. Bacterial RNA is much tougher and sequences have been recovered from ice crystals that are 419 million years old. These are only short fragments of 55 base pairs though.
One thing that is funny about people who believe in evolution is the amount of giant leaps of faith they do. They try to peddle genetic analysis as some kind of irrefutable proof for evolution being true when the material available is so shitty and meager. You find bacterial RNA that contains 55 base pairs and try to "compare" this with the human genome that contains 3 000 000 000 base pairs. This is why the theory of evolution (emphasis on the word 'theory') is 100% theoretical and not factual. You just make shit up as you go along and claim these assumed "evolutionary" events took place without a shred of evidence.
The molecular apparatus has complex ways of generating inse tions and deletions in DNA, which we are only beginning to understand. For example, a stretch of DNA from a ribosomal RNA gene is forty bases long in humans and ﬁfty-four bases long in orangutans. The sequences on either side match up perfectly. How do we know what bases correspond between the two species, how do we decide how many substitutions have occurred, when obviously some have been inserted and deleted as well? The problem is that we cannot tell which DNA sequence alignment is right, and the one we choose will contain implicit information about what evolutionary events have occurred, which will in turn affect the amount of similarity we tally. How similar is this stretch of DNA between human and orangutan? There may be eight differences or eleven differences, depending on how we decide the bases correspond to each other across the species—and that is, of course, assuming that a one-base gap is also equivalent to a ﬁve-base gap and to a base substitution. This is the fundamental problem of homology in biology: What is the precisely corresponding sequences in the other species? The answer is that no one knows.