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> > QUOTE: [i]"Widely known simply as the Turing Model, RD is a theoretical construct used to explain self-regulated pattern formation in the developing animal embryo.
> > 
> > "The model, Cooper says, explains the progression of epithelial appendages – external structures such as hair, feathers, scales, spines and teeth – over at least 450 million years, a timeframe that spans the evolution of vertebrates.
> > 
> > "These structures, he says, all possess similar developmental positioning in relation to one another because they grow from a common foundation – the thickened areas of the epithelium known as placodes.[/i]
> > 
> > DAVID’s comment: [i]Perhaps the diversity is not as diverse as it appears. More evidence patterns guide evolution. Easy to imagine a designer would set up patterns in advance. It helps explain convergence[/i].
> > 
> > dhw: The article clearly illustrates common descent. I find it easy to imagine self-regulating cells/cell communities combining to form patterns and, as conditions change, changing their patterns in an ongoing process of variation and innovation. I don’t see patterns “guiding” evolution, but evolution resulting from organisms creating and varying patterns.  Convergence simply means that organisms develop similar patterns to deal with similar conditions. What I find difficult to imagine is organisms developing (or in your hypothesis being given) new patterns in advance of the conditions that require or allow for change.
> 
> It may be hard for you to imagine, but imagination is not scientific evidence. I've presented many articles on patterns that are found, like this one.