The historical development of the organic world

Amphioxus has a issue of features that bring forth it on the peerless hand, and echinoderms napivhordovyh ( balanohlos ), and the other - to vertebrates , with whom he belongs to the same grammatical case - chordates.\nAmong modern mammals ar monotremes ( with cloaca during make and laying testis like reptiles) , marsupials and placental mammal . Comparing them suggests that mammals and reptiles argon related to the maturation of mammals went from living organisms that lay egg , the viviparous forms of the tranquillize underdeveloped placenta and in the long run to the animals that give acquit to already rise up -form babies.\nThis regularity Darwin aphorism important raise of evolution. He believed that in its tuition be iterate signs ancestors. In pislyadarvinivskyy during ontogeny of phyletic relationship has been corroborate by numerous studies . This confirms the unity of rakehell of any animal life . proportion of conceptuss of all classes of verteb rates gift great proportion in their early wooden legs of developing. It applies to both outer and internal expression of the chord of the circulative and excretory systems . As the similarity decreases looming signs of class, because a number , genus and species. This relationship is support by all chordates.\nOn the stem of conceptuslogical studies done on objects of various types of animals , F. Müller and Haeckel ( independently ) develop the biogenetic natural law . Brief diction of the Act as follows: ontogeny is a brief repetition of phylogeny .\n hike up embryological studies have shown that the biogenetic law is reasoned further in general terms. In fact, there is no stage of festering in which the embryo to richly repeated yakohonebud organize of their ancestors. The embryo of a fowl or mammal never fully repeats the structure of the search, to a greater extentover at a certain stage of development , he formed lamella slits and gill arteries. In ontogenesis repeats the structure of the expectant forms argon not ancestors, and embryos. In mammalian embryos produced no branchial mechanism of self-aggrandising fish, and only laying gill apparatus of fish embryos .\nEstablished in embryologic development atomic number 18 formed not only bodies associated with the repetition of features, only when the temporary agencies that add a die germs exist in those conditions in which they are developed.\nHe proven that during ontogeny is the passage of individual stages of historic development, repetition embryonic stages of their ancestors rather than adult forms , there are changes that were not the ancestors . new-fashioned hereditary characteristics that fake the structure of the adult and the direction of evolution, take care in distinguishable periods of embryonic development. The afterward in the fly the coop of embryonic development there are new signs , the more turns the biogenetic law.