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Every kind of animal andthe plant has its limits of cold and heat, in which hecan exist; and these limits largely determinethe geographical position of the species. It cannot extend to the Northknown latitude, because he can't stand more severe winters and at the samemay not extend to the South, because the summer it would betoo hot. Is also so that the effect of temperature on the humidityair or on the distribution of organisms known species feed on,an indirect way of preventing it from spreading beyond the known limits.The question now is which result will slow climate changethe events as described above? Suppose that we took a pointdeparture an era when the seasons least dramatically different from onethe other; obviously, during the transition to the era of the most sharpopposites every kind of animal and of plants will gradually changethe boundaries of the distribution shifts further where increasing wintercold, and where the increasing years of żary, and will be disposed of in suchareas that still represent favorable conditions for itsexistence. Thus, in the course of ten thousand years for eachkind of tide will occur from the well-known areas inhabited them before, and in thecontinuation of the new ten thousand years will happen again the tide in these areas.Remnants of it will disappear from the layers formed in these areas, and will not beto appear in the next few reservoirs; they thenwill appear in the layers lying on top. But in what form they will appearagain? Being exposed during the 21,000 years of their slow retreatand an equally slow return peremestivsheesya living conditions, theyof course, and will undergo changes and, in all probability duringsecondary its appearance will present some differences in the structure,maybe in the appearance of a new form of modification, maybeand a new subspecies.
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