Review of Selected Aspects of Neoplastic Progression in the Mammalian Orders

摘要: Progression of neoplastic diseases seems to be highest developed and most diversified in mammals. This is due the diverse body structure great variation this class vertebrates, comparison for example other warm-blooded animals, birds. In taxonomy, mammals are considered step phylogenetic development. We know, however, from paleontology that last group appear on earth were They appeared Jurassic, whereas had already evolved Triassic. The plan small birds large ones very similar arrangement, exhibits diversification. Also size different groups varies much less than same case with life span. Variation among mammalian types becomes readily clear if one compares four smallest found insectivores bats. pigmy shrew, Microsorux crawfordi a length 51 61 mm weight 2.1 6.3 gr, shrews Suncus etruscus Sorex minutus smallest; bat Craseonycteris thonglongyai also small, 29 33 about 2 grams.