I was dissapointed. I was expecting to see a list of anatomical changes that appear to be new within the last 2 or 3 thousand years. The dissapearance of wisdom teeth in some people would be a perfect example.
posted on 01/13/2009 8:32:45 PM PST
(Si Vis Pacem Para Bellum (If you want peace prepare for war))
> I was dissapointed. I was expecting to see a list of
> anatomical changes that appear to be new within the last
> 2 or 3 thousand years.
Wisdom teeth, Darwin’s point, and the Plantaris muscle all made the list, and they would all seem to be just that kind of change.
The dissapearance of wisdom teeth in some people would be a perfect example.
Early humans ate a lot of plants - and they needed to eat them quickly enough that they could eat a sufficient amount in one day to get all of the nutrients they needed. For this reason, we had an extra set of molars to make the larger mouth more productive. This was particularly essential as the body lacked the ability to sufficiently digest cellulose. As evolution made its selections, our diets changed, our jaws grew appropriately smaller, and our third molars became unnecessary. Some human populations have now all but completely stopped growing wisdom teeth, while others have almost 100% likelihood of developing them.
posted on 01/13/2009 8:40:03 PM PST
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