Talk:Ontogeny and phylogeny
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parts of the organism may be genetically linked with newer parts depending on old ones, but there may also be a functional link, the newer brain cannot function without the old backbone, so that embryos that develop them in the wrong order dies.
More interesting, some (Maturana, Valera, complexity scientists and others) hold the belief that functionally the parts of an organism are intimately linked, with a depending on b, depending on c that may depend on a again. a circular dependence. But in evolution we are presented with a linear dependence a-b-c Are they both right?