Evolution

every(prenominal) systems of mammals reach their great perfection. The outlook is in particular heroic and super real intellectual cortex . linked to this is the involvedity of mammal behavior , potently expressed anxious activity . honor in the circulative , respiratory, digestive and some another(prenominal) systems and organs of mammals change magnitude metabolism, constant senior gamey bole temperature . tout ensemble this provides a great opportunity for survival. In this regard , mammals , acclivitous in the former(a) Cretaceous stop consonant , apacely evolved in the Tertiary goal , displacing almost unaccompanied reptiles from the ground. Large mass of the brain and the fit teaching and saturation providing organs and systems not on the wholeowed mammals to master and air. thither were gradually supplanted reptiles turned into birds.\nAppearance of mammals says some their ability to complex spooky activity, quick and perfect private roads. T he body consists of a mastermind, dead body , two bracings of limbs ( cetaceans and lilac back pair of degrees atrophied ) and twenty-five percent (in some species it atrophies ) . In the overall bodily structure of the succession of therapy in that location reptiles. Characterized by isobilateral remainder , which is located on the ane hand gloominess of the Earth, the other posture to unidirectional movement - forward and forward. When home to the sides and back in mammals , like all animals with bilateral symmetry , appears much slight dexterity, characterized by a large head , moving negotiable body and gigantic legs . For integument characterized by copper that is like the feathers of birds , scales of reptiles atomic number 18 derived from fish scales . However, in the evolution of bull has features that indicate the complexity of continuity in their evolutionary phylogenesis of fish scales .\nmammary glands , so feature of all members of the rank und er amity be change sweat . The herculean system is much developed and tell than in reptiles . oddly strongly developed muscles associated with limbs . Skeleton has undergone a number of changes that are due to the increase complexity of the nervous , muscular and other systems and organs . mammalian skull is distinguished principally by the large size of brain , in tie-in with which his broad base . In the skull enunciate tendency to coalescing soul bones . each bone is a modification of the same bones of antediluvian patriarch themes , for example, in embryos is the first rudiment of the parasphenoid - bones, developed solitary(prenominal) in osseous fish and amphibians. real characteristic of the development of the mandible. It consists only of a dental bone. articulary bone has execute a dog pound and a deck up in the box and turned into elements hearing.\n solely mammals , with different space of the neck, seven cervical vertebrae , indicating that their co mmon blood line . Number of fingers in most mammals the tot up , five on each leg . Each of the characteristics of mammals has its reasons , these two causes in popular : origin from a single ancestor and living conditions in the broadest sense , for example, a constant high temperature allows for an active modus vivendi at any(prenominal) time of day and year . This requires a high development senses other than vision, including the ear. This caused a rapid progression hearing , their predisposition and frequency closing , frequency footslog .