(1) Since this field of biogenesis is not available to us, we shall do as biologists do and turn to ontogenesis .(2) Shepard proposes that humans go through eight stages of ontogenesis in their first twenty years of life.(3) Ductal plate malformation results from persistence or absence of remodeling of the embryonic ductal plate during ontogenesis .(4) Some degree of variation seems attributable to ontogenesis , as large morphological distances are observed between young and adult specimens.(5) The concepts of penetrance and expressivity and also of the systemic regulation of the formation of phenotypic traits - the foundation of phenogenetics and the genetics of ontogenesis .(6) Thus, the resultant planktonic cephalopods are probably trapped, either evolutionarily or ontogenetically .(7) Combined with their occasionally distinctive morphologies, it would appear that they represent structures ontogenetically and functionally distinct from the botuliform cells.(8) This is obvious but important, because if camerae can be derived from fossae ontogenetically then they can also be derived from fossae phylogenetically.(9) Thus, there is no mechanism of ontogenetic developmental concrescence, just differentiation.(10) The activational effects of sex-limited steroids buffer male and female phenotypes from ontogenetic conflict.(11) In some species, males facultatively or ontogenetically switch between these tactics, and in other species the tactics appear to be fixed for an individual's lifetime.(12) In the other clade characterized by a static level of disparity, Clade 5 the structure changes ontogenetically , although more subtly than in Clade 4.(13) During its ontogenetic growth, an organism would experience various developmental events.(14) This phenomenon owes its existence to both phylogenetic and ontogenetic naturalistic processes.(15) Extant birds are the most appropriate models for understanding the ontogenetic and phylogenetic development of PSP in sauropods.
