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We can meet cases when we make sure that there is norelated modifications in such cooperating parts whichlocated in the body adjacent each other; hereinafter, also can notto be of such modifications in such parts, which, although belong tovarious tissues, but are closely related to each other, for example teeth and jaw;you can not find the last related modifications even in suchcooperating parts, which are closely connected, and built from one and thesame fabric as, for example, eyes and eye-stalks of cancer. If so, what then can we say about such cooperating parts whichsimultaneously constructed from different tissues, yet located indifferent parts of the body? Not only do we not dare to say that such partschanged together, but on the contrary: we deem it right to declare that theynever had the tendency to vary together. If so, howit is difficult to explain such changes, when one part of the bodyincreases without a corresponding increase in other parts, involvedthe first action, and when such an increase may not be as usefulfor the animal. In 1864 ("Foundations of biology", 166) I have referred as proofone animal with heavy horns, namely, the extinct Irish elk Iwas many changes in bones, muscles, vessels, nerves,forming the front half of the body for which was the need toincrease, in order to increase the horns could be beneficial. NowI turn to another example - for example the giraffes. I choose the last examplepartly because in the sixth edition of "Origin of species", published in 1872G., Darwin, examining different arguments against his theory, takes the example of itanimal. He says: "in order For any animal purchasedstructure and strongly developed, almost a necessaryto and some other parts were modified and adapted. Thoughevery part of the body varies slightly, but it does not follow that the necessaryparts had to be changed always in the forward direction and in a straight linedegree."
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