<Li> History of paleontology (timeline) </Li> <Tr> <Td> Fields and applications (show) <Ul> <Li> Applications of evolution </Li> <Li> Biosocial criminology </Li> <Li> Ecological genetics </Li> <Li> Evolutionary aesthetics </Li> <Li> Evolutionary anthropology </Li> <Li> Evolutionary computation </Li> <Li> Evolutionary ecology </Li> <Li> Evolutionary economics </Li> <Li> Evolutionary epistemology </Li> <Li> Evolutionary ethics </Li> <Li> Evolutionary game theory </Li> <Li> Evolutionary linguistics </Li> <Li> Evolutionary medicine </Li> <Li> Evolutionary neuroscience </Li> <Li> Evolutionary physiology </Li> <Li> Evolutionary psychology </Li> <Li> Experimental evolution </Li> <Li> Phylogenetics </Li> <Li> Paleontology </Li> <Li> Selective breeding </Li> <Li> Sociobiology </Li> <Li> Systematics </Li> <Li> Universal Darwinism </Li> </Ul> </Td> </Tr> <Ul> <Li> Applications of evolution </Li> <Li> Biosocial criminology </Li> <Li> Ecological genetics </Li> <Li> Evolutionary aesthetics </Li> <Li> Evolutionary anthropology </Li> <Li> Evolutionary computation </Li> <Li> Evolutionary ecology </Li> <Li> Evolutionary economics </Li> <Li> Evolutionary epistemology </Li> <Li> Evolutionary ethics </Li> <Li> Evolutionary game theory </Li> <Li> Evolutionary linguistics </Li> <Li> Evolutionary medicine </Li> <Li> Evolutionary neuroscience </Li> <Li> Evolutionary physiology </Li> <Li> Evolutionary psychology </Li> <Li> Experimental evolution </Li> <Li> Phylogenetics </Li> <Li> Paleontology </Li> <Li> Selective breeding </Li> <Li> Sociobiology </Li> <Li> Systematics </Li> <Li> Universal Darwinism </Li> </Ul> <Li> Applications of evolution </Li>

Of all the species that have ever existed how many are now extinct