<Li> History of life </Li> <Li> Timeline of evolution </Li> <Tr> <Td> History of evolutionary theory (show) <Ul> <Li> Overview </Li> <Li> Renaissance </Li> <Li> Before Darwin </Li> <Li> Darwin </Li> <Li> Origin of Species </Li> <Li> Before synthesis </Li> <Li> Modern synthesis </Li> <Li> Molecular evolution </Li> <Li> Evo - devo </Li> <Li> Current research </Li> <Li> History of speciation </Li> <Li> History of paleontology (timeline) </Li> </Ul> </Td> </Tr> <Ul> <Li> Overview </Li> <Li> Renaissance </Li> <Li> Before Darwin </Li> <Li> Darwin </Li> <Li> Origin of Species </Li> <Li> Before synthesis </Li> <Li> Modern synthesis </Li> <Li> Molecular evolution </Li> <Li> Evo - devo </Li> <Li> Current research </Li> <Li> History of speciation </Li> <Li> History of paleontology (timeline) </Li> </Ul>

What is the most common cause of extinction