All species on Earth have descended from other species and a single common

All species on earth have descended from other

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formation of new, separate species. All species on Earth have descended from other species and a single, common ancestor lies at the base of the evolutionary tree. Natural selection has been the most important force in shaping evolution. Through natural selection, the "fit" of an organism with its environment will select those traits that will be passed on with greater frequency from one generation to the next. Groups of living things evolve in the direction of traits that increase survival and reproduction. Five lines of evidence are consistent with the theory of evolution. (1) Radiometric dating indicates that the Earth is greater than 4 billion years old. (2) The placement of fossils is consistent with the theory of evolution and with radiometric dating. (3) The theory of evolution explains the common occurrence of homologous physical structures in different organisms. (4) The theory of evolution is consistent with variations found in the DNA, RNA, and protein sequences of various organisms. (5) Experimental demonstrations of evolution have been carried out in the laboratory and in nature.
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