Description: Presents the story of teeth – from the earliest tooth-bearing fishes hundreds of millions of years ago through amphibians, reptiles and, ultimately, mammals
Teeth are amazing – the product of half a billion years of evolution.
My comment: Teeth are phenotypic manifestations of how ecological variation is linked from the epigenetic landscape to the physical landscape of DNA in the organized genomes of species from nematodes to mammals. No matter how many times I attest to the fact that teeth obviously arose in the context of RNA-directed nutrient-dependent DNA methylation and the metabolism of nutrients to species-specific pheromones that control the physiology of reproduction in species from microbes to man, Jay R. Feierman will post information like this to the ISHE human ethology yahoo group to keep members focused on the pseudoscientific nonsense of neo-Darwinism.
See, instead: System-wide Rewiring Underlies Behavioral Differences in Predatory and Bacterial-Feeding Nematodes reported as: The neurobiological consequence of predating or grazing “”The patterns of synaptic connections perfectly mirror the fundamental differences in the feeding behaviours of P. pacificus and C. elegans”, Ralf Sommer concludes. A clear-cut result like that was not what he had necessarily expected.””
If it took millions of years for P. pacificus to evolve the first tooth, the species would have gone extinct. Instead, what happened was this: RNA-directed DNA methylation led from a difference in nutrient uptake to an ecological adaptation in mouth parts, such as teeth, which is a common occurrence in cricket species and humans. The concurrent system-wide rewiring led to an adaptation of behavior.
Serious scientists realize that DNA methylation leads to amino acid substitutions and cell type differentiation via nutrient-dependent pheromone-controlled reproduction in species from nematodes to humans. Only people like Feierman continue attempts to mislead others.