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Originally posted by npetreley
I've got to hang this one on my wall. Here you have it, folks. A classic example of evolutionist thinking.
You failed to provide any evidence whatsoever -- NOT EVEN ANECDOTAL EVIDENCE -- that babies have a second set of teeth already formed (or as "nubs" below the surface.
Now I must admit that this is actually fairly logical, since they're going to get their second set in as little as 5 years. But logic doesn't prove anything, it just presupposes something. What you REALLY need is EVIDENCE. EVEN ANECDOTAL evidence would help -- at least that would give you a start.
So do you provide any?
No. Instead, you provide the X-ray of a 7-year old -- a child that is actually IN THE PROCESS OF GETTING HIS SECOND SET OF TEETH.
This fascinating X-ray shows that the second set of teeth are present.
DUH! HE'S IN THE PROCESS OF CUTTING HIS SECOND SET RIGHT NOW -- OF COURSE HIS SECOND SET OF TEETH WOULD BE PRESENT IN THE X-RAY!
But that simply obvious fact doesn't deter your imagination.
You extrapolate that because you can see them when he's 7, he must have had these teeth in his gums when he was a baby! Again, no evidence whatsoever. You just IMAGINE that this is true. Whether or not it is true is totally irrelevant -- it may very well be true. But YOU HAVEN'T DEMONSTRATED IT EVEN WITH ANECDOTAL EVIDENCE YET, so most reasonable people would stop there before even postulating the next theory.
But no -- that's not evolutionist thinking works.
On the basis of the unproven first extrapolation -- that the second set would be present in babies -- YOU EXTRAPOLATE THIS FURTHER A SECOND TIME TO ASSUME THAT THE THIRD SET OF TEETH WOULD ALSO BE PRESENT IN BABIES, EVEN THOUGH THEY WON'T CUT THEM FOR ANOTHER 100 YEARS.
Perhaps their absence in infants (and adults) is not so telling. After all, sharks form new teeth in adulthood from skin tissue, and have them lined up and waiting for one to fall out. However, it is a valid objection, since every other human organ develops during gestation and shortly after.
Again. No evidence whatsoever, NOT EVEN ANECDOTAL EVIDENCE. But you ASSUME it must be true, because that's how YOU PERSONALLY BELIEVE IT SHOULD WORK. In fact, you are so vehement in your assumptions that you won't even believe that people can cut a third set of teeth (in spite of evidence to the contrary) unless their body obeys the rules of your imagination.
Or is consistent with the knowledge of human growth & development ---- OR unless there is good evidence that it can happen, such as a couple of well-documented cases in the medical literature.
In other words, your imaginary rules take precedence over any substantial evidence whatsoever, because wherever the evidence is lacking, you have the ability to fill in the gaps with your imagination.
That's the core philosophy of evolution.
There is a thread here for you!!!!
Originally posted by RufusAtticus
Here is a link explaining the development and difference between deciduous and permanent teeth.
Calcification begins during the fourth month of fetal life. By the end of the sixth month, all of the deciduous teeth have begun calcification.
By the time the deciduous teeth have fully erupted (two to two and one half years of age), cacification of the crowns of permanent teeth is under way. First permanent molars have begun cacification at the time of birth.
Can you explain how the third set fits into this
Wow, Nick, in all your hand waving and ranting you never got around to explaining the biology of tooth formation for the third set. What is so special about them that don't show up on x-rays and by pass the requirements of development?
Originally posted by chickenman
you still have a major problem npeterley - a 3rd set of teeth does not make living to 900 years of age possible
Originally posted by seebs
Indeed! I have some distant cousins on my dad's side who went through about 5 sets in a normal lifespan. The whole family. No one ever found out why.
Originally posted by chickenman
you still have a major problem npeterley - a 3rd set of teeth does not make living to 900 years of age possible
Originally posted by Jerry Smith
Five sets of NATURAL teeth? REALLY? Tell us more... maybe there IS something to Nick's otherwise poorly supported hypothesis of extra sets of teeth...
Originally posted by chickenman
you missed the point entirely npeterly- you need a new brain, a new liver, a new heart as well- where is your documented evidence that cell division occurs at a rate adequate enough to maintain these organs? Don't bother looking because you won't find any
Originally posted by chickenman
oh sorry, I see, so anecdotal evidence of people getting a third set of teeth could be possible evidence that people once lived 900 years old, but you have yet to explain about all the other things that would need to regenerate for this to happen - fair enough
and the fact remains that the cells most vital to human existence (neurons) stop dividing after adolescence (except olfactory neurons)
So the baby teeth form early, as one would expect. The first permanent molars begin calcifictaion [sic] at birth, but the rest of the teeth do not begin calcifying until 2 to 2 1/2 years of age (toddler). In other words, they are not present in X-rays of babies because they haven't formed yet.
Based on your link, I would guess that the third set of teeth behave just like the first and second. They form in advance of when they emerge (duh). How far in advance seems to depend on which kinds of teeth, and when the "target date" is for emerging. Your link demonstrates clearly that there is no evidence that the teeth must have formed 100 years in advance of when they will emerge. Quite the contrary, it plainly says that most permanent teeth don't start to calcify until you hit 2 to 2 1/2 years old, which is about 3-5 years before the child cuts those teeth.
Originally posted by chickenman
well see, the fact is, neurons do not keep dividing after adolescence
Originally posted by RufusAtticus
But that's not how development works. Everything is laid out in fetal and early childhood development. That's how our bodies work. An easy example is female reproduction. A woman has no use for a uterus or a birth canal until she hits puberty, yet she is born with them. Your argument would have us expectation a girl to lack most of her internal reproductive organs until she is about seven.
Originally posted by npetreley
No, your argument is that the first egg has to form and then sit there and wait until the girl hits puberty.
Originally posted by RufusAtticus
Read that again, Nick. It's referring to the crowns, which form only part of a tooth.
By the time the deciduous teeth have fully erupted (two to two and one half years of age), cacification of the crowns of permanent teeth is under way. First permanent molars have begun cacification at the time of birth.
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