DO YOU KNOW THAT "FOR A FACT???" Have you sequenced the DNA of a good sample of the seals? Or are you aware of a scientific report on that very experiment? And of what quality are these mutations and are they getting passed on or eliminated in further reproductions? Etc. etc. etc. Do the cheetahs carry several such mutations too?
This is NOT something you "know for a fact," this is something you ASSUME because of your preconceptions.
We do know this "for a fact" and, no, as far as I know the experiment has never been carried out on seals. But it has been carried out in humans and a variety of other mammals, in vertebrates, in multiple strains and species of bacteria and archaea and even in non-living viruses.
All show multiple mutations from their parents.
The fundamental principle of scientific investigation is that you
can generalise discoveries to novel situations. We don't have to rediscover the first and second law of thermodynamics everytime we look at a new chemical reaction, for example, and we don't need to investigate DNA replication in seals to assert that they exhibit mutations because we already know that it's a general property of living systems.
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