Please explain evolution.

Actually, genetic protein sequences are quite resistant to change. The first layer of protection from mutation is redundancy in the genetic code itself:shape>

There's a fair number of amino acids that have codons with two or even three differing bases. But you're right that that isn't most of them. And for most of them, the first codon nucelotide has to be the same.But for most of them, the second and third can be changed. (Maybe you missed that some of them are listed twice?) I would offer that 2 out of 3 is large enough to be described as "probable." Fair enough: CB150: Functional genetic sequences changing

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The analogy with language is flawed. Proteins are far more flexible. They can differ greatly in their sequence similarity, even 70-80% or more, and still have the same function.

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The bibliography is at the bottom; the page does not make it clear which reference supports which claim, specifically. That may be. The page does not say.Perhaps I overstated my claim. Nonetheless it's fairly clear that there is much resistance to mutation in the protein generation mechanism.

What? Serine's second base has synonymous substitutions. As does it's first base.But now that I look closer, I see that you're right - its not nearly as common as I had thought. Fair enough.Aren't we getting just a bit pedantic?