Subduction Zone
Veteran Member
I never claimed that they were vestigial. And why do you think that evolution has to eliminate them?So you are saying that terminology is very important, am I right about that? Meaning the difference between useful and necessary, as if to say tonsils are vestigial organs NOT NECESSARY in the human body. Yet for some funny reason the evolutionary structure according to you has not eliminated them. Or have they? It's just one of those things that keep duplicating but not necessary. (Right?)
You also say that useful is not necessarily necessary in terms of biologic importance, is that right according to you? So please -- try to answer what is it that you say tonsils are not necessary for? Thank you.
At any rate the tonsils are part of the immune system and it works better with them. But back to vestigial structures. A clear example is that of the eyes of cave fish. They are not totally gone, they are merely degraded to the point that they do not work any more. Those are the sort of structures that might almost disappear eventually. I say almost because there are often genetic traces of them. Like the teeth that can be made to grow in chickens. Biologists have managed to turn those genes back on. Genes do not disappear, if they are not needed they mutate to the point that they no longer work as they used to. For example our ancestors had a diet rich in vitamin C. Many mammals have a gene that can make vitamin C. We do too, but ours is broken. And example of a vestigial gene. It won't disappear altogether because there is no way to eliminate it.