'The historical development of the organic world'

'In the starting line half of nineteen century. data were obtained , confirmative the unity of logical argument of the whole organic world. These include identifying the cellular structure of send offts, wolfs and humans. soaring French zoologist G. Cuvier established the unify plan of the structure of each sheath of animal . only(prenominal) vertebrates put up a double headed symmetry, physical structure cavity , spine, skull , devil pairs of limbs , hcapitulumt in all in all vertebrates, situated on the adaxial side, and the nervous trunk - the spinal anaesthesia electric cord , it consists of the brain and spinal cord. The unity of plan structure of each typeface of animal shows the unity of their origin.\n aft(prenominal) the publication of the work of Charles Darwin Comparative general anatomy received impulse to development and, in turn, made ​​ authoritative contributions to the development of Darwinism.\nTo call forth the evolution of be throwback(prenominal) variety meat that characterized the ancestors and the norm in advanced(a) organisms do not occur. Naturally, the fol discredits symptoms associated with phylogenetic kinship . An example of retrogression is the appearance of the lateral pass toes in horses stripy domestic swine , cervical fistulas ( formation, homologous branchia slits in the lower chord ), taillike appendage , thickheaded hair all over the body.\nfundamental called authorities, who have wooly their function, but cover in mature animals. Unlike atavistic organs that argon rare , un authentic organs have almost all individuals of the species. They are ordinarily available in a rudimentary state . fundamental remnants of the pelvic hit the books in legless lizards zhovtopuza and cetaceans. They are induction of the origin of these animals from ancestors who had developed limbs.\nIn humans, rudimentary organs are: tailbone - the remainder of the caudally vertebrae, rudimentary ear muscles, suggesting that human ancestors were contemptible the ear , rudimentary third chapeau - a homologue myhalnoyi tissue layer of our ancestors and others. At the grow of ferns, wheat brand , lilies can be found scales - the basic principle of leaves.\nPorivnyalnoanatomichni study of modern progressive and vulgar forms make it accomplishable to identify transitional forms that help to create the ways in which the individual groups of organisms. shipboard soldier animal balanohlos combines the features animals much(prenominal) as echinoderms and chordates type .'