megamanXplosion wrote:real life wrote:As you know Ros, it is not empirical evidence that is under question, but the interpretation[/b] of evidence.
Phylogenetic analyses (DNA comparisons) do not leave much room for interpretation.
They certainly do.
You must assume evolution to prove evolution.
Just showing that two creatures are similar, even that their DNA is similar, does not mean that one descended from the other.
Why would it be unusual for two creatures, sharing the same environment, the same food supply, the same challenges with predators, etc to also have similar features to survive and thrive in said environment, and these features based on similar chemistry?
What's unusual about that? If you were going to design two creatures , you might use a common pattern and common chemical processes to achieve the same ends in both.
Then again you might not, and thus you can also have two very dissimilar creatures that can also thrive in the same environment.
But none of this demands that one MUST have descended from the other. You must assume evolution is true in order to reach that conclusion. It becomes a circular argument.