Quote from Opening post
"If all living things evolved from a common ancestor then we can make a prediction about the differences between the Cytochrome C protein in different species. We would expect them to differ from each other in a predictable way that mirrors their evolutionary history.
This is exactly what we find.
The more distant any two species are from each other in evolutionary history the more differences there are in their amino acid sequences." End Quote
Where are you saying this "evolutionary history" is located? From what I read from evolutionist sources, evolutionists take living creatures, look at their similarities, and from these construct hypothetical evolutionary trees from them. The construction of these tree "phylogenies" is based on the assumption of evolutionary common descent and based on the prinicpal of coming up with the hypothetical tree that requires the least amount of changes not consistent with common descent [ie. the least amount of so called "convergence"].
Now, if evolution were somehow "known" to be true then such an exercise might be useful in coming up with the most likely version of evolutionary history, but it is not in itself an objective extant "evolutionary history" since its based on living creatures combined with the assumption of evolution.