Evolution theory and teratology

What I mean by teratology very broadly is any discourse about freak babies or anomalous features in babies or birth deformities.An example of teratological phenomenon is a lady I know who is absolutely normal and even pretty, but in her small finger of the left hand there is a very small protruding finger like a twig from a branch of a tree.Are teratological features of offsprings the changes that are taken to be mutations, which will be naturally selected according to the circumstances of environment, so that after millions of years a different species will appear?I can speculate that the lady with that extra very small finger in the left hand small finger and all others like her, men and women, after millions of years will become a different species of homo sapiens or sub-species.What is the use of such a small extra finger?Why, in my part of the world we eat a small snail that is at most 3/4 inch in diameter and we have to use a thorn from the rose tree to pick out the organism inside to get to it and eat it.So such people with an extra small finger need no longer use a thorn from the rose tree, they can use their extra small finger and thus have one advantage over people without the extra small finger.If and When the only food available to mankind are those small snails, then they will definitely survive in the long run after millions of years while the rest of mankind without the extra small finger will become extinct.Anyway, tell me, knowledgeable people here, are teratological features facts of evolution as intended by the theorists of the evolution theory?Yrreg

Mutation and millions of years determine good, bad, or neutral mutation.Mutation can be good, bad, or neutral.We will know that after millions of years and we are still around and the mutation proves to be good.Good meaning I am sure, the members of the mutated species have survived to the present.Bad is when the mutation did not enable the changed species to survive millions of years.And neutral if the mutated feature is still around but we can't figure out why it is still around, how it serves in enabling the mutated species to survive to the present.That is really scientific thinking in terms of what, like for example the theory of relativity?Yrreg,

Of course you have got stock answers to all the questions people outside your box address to you.Stock answers from the stocks of your authority doctrinaire mentors.Plus the stock strawmen.Just one more question:What is the natural factor in natural selection?Is it the blind and purposeless nature that should not care anything about survival of whatever, as to lead to stability of surviving species, in the time span they do survive in?Yrreg