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Although we knowthat is a rough job the dermal layer may be so excited by thatdevelops much thickened epidermis, in some cases, absolutelyHorny, and although it is easy for us to admit the hypothesis that this phenomenon, oftenrepeating, can become hereditary, however, such reason is notcan you explain to us the shield of a turtle, arms and armadillaimbricate the tire of a pangolin (Manis). The skin of these animals does notthere is more work than the skin of any other animal covered withhair. Original spines, sharply distinguishing the head of a Hornbill, notcan occur as a reaction in response to external forces. Even if to admit them purely protective value, it is not feasiblewe assume that the head of Hornbill in more need of protection than the headany other birds. If we consider the obvious, that the total mass of the integumentsanimals in some cases due to the degree of action on theanother part of the body outside influences, if to be admissible that the development offeathers of the preceding forms of the skin resulted from excessivepower caused by excessive surface circulation, with all thathowever, we still wouldn't explain the structure. Similarly, we would not have foundno key to the explanation of special types of feathers: many scallopsbirds; tail feathers, sometimes extremely long; strangely locatedfeathers birds of Paradise, etc. etc. The more obvious the impossibility to explaineffect of use or disuse coloring animals. Noa direct adaptation of forms to the administration could causeeducation blue mounds on the face of the mandrill, banding skins, tiger,the gorgeous plumage of a Kingfisher, eye spots on the tail, or a peacock,finally, a variety of patterns on insect wings. Just oneexample - the example of the horns of the deer, to show how inadequate forone explanation for the above reason During your growth deer antler allstay the use, to the same time when they becomeready to eat, they are already cleansed of the dead skin and enveloptheir dried blood vessels, being devoid of nerves and blood vessels, theybecome incapable of any change of the structure,due to a change in the function.
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