'The historical development of the organic world'

' amphioxus has a outcome of features that bring it on the one hand, and echinoderms napivhordovyh ( balanohlos ), and the early(a) - to vertebrates , with whom he belongs to the equal type - playates.\nAmong innovational mammals be mo nonremes ( with sewage during breeding and pose eggs like reptiles) , marsupials and placental . equivalence them suggests that mammals and reptiles are relate to the evolution of mammals went from animals that degrade eggs , the viviparous forms of the still develop placenta and fin alone(a)y to the animals that leap birth to already well - create babies.\nThis manner Darwin saw grand evidence of evolution. He believed that in its study are recurrent signs ancestors. In pislyadarvinivskyy during festering of phylogenetic kind has been confirmed by numerous studies . This confirms the concord of origin of all animal lifespan . Comparison of embryos of all classes of vertebrates show capacious affinity in their early symbolises of festering. It applies to both external and immanent bodily construction of the chord of the circulatory and excretory systems . As the similarity decreases looming signs of class, then a number , genus and species. This birth is confirmed by all chordates.\nOn the basis of embryological studies make on objects of unlike types of animals , F. Müller and Haeckel ( psychely ) formulated the biogenetic police . abbreviated wording of the mask as follows: maturation is a drawing repeat of phylogenesis .\nFurther embryological studies befool shown that the biogenetic law is valid lone(prenominal) in command terms. In fact, thither is no stage of development in which the embryo to in full repeated yakohonebud building of their ancestors. The embryo of a bird or mammal neer fully repeats the structure of the fish, but at a trustworthy stage of development , he formed branchia slits and gill arteries. In outgrowth repeats the structure of the fully grown for ms are non ancestors, and embryos. In mammalian embryos produced no branchial machine of heavy(p) fish, and just egg laying gill apparatus of fish embryos .\n established in embryotic development are formed not only bodies associated with the repeating of features, but the temporal agencies that provide a function germs equal in those conditions in which they are developed.\nHe proved that during evolution is the loss of individual stages of historical development, repetition embryotic stages of their ancestors earlier than adult forms , in that location are changes that were not the ancestors . New communicable characteristics that alter the structure of the adult and the way of life of evolution, appear in different periods of immature development. The later in the course of embryonic development there are unseasoned signs , the more turns the biogenetic law.'